CVE-2025-40257

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2025-12-04. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2025-201200 (ENISA EUVD) · GHSA-q4wq-g3wm-gmfc (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix a race in mptcp_pm_del_add_timer()

mptcp_pm_del_add_timer() can call sk_stop_timer_sync(sk, &entry->add_timer) while another might have free entry already, as reported by syzbot.

Add RCU protection to fix this issue.

Also change confusing add_timer variable with stop_timer boolean.

syzbot report:

BUG: KASAN: slab-use-after-free in __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616 Read of size 4 at addr ffff8880311e4150 by task kworker/1:1/44

CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events mptcp_worker Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __timer_delete_sync+0x372/0x3f0 kernel/time/timer.c:1616 sk_stop_timer_sync+0x1b/0x90 net/core/sock.c:3631 mptcp_pm_del_add_timer+0x283/0x310 net/mptcp/pm.c:362 mptcp_incoming_options+0x1357/0x1f60 net/mptcp/options.c:1174 tcp_data_queue+0xca/0x6450 net/ipv4/tcp_input.c:5361 tcp_rcv_established+0x1335/0x2670 net/ipv4/tcp_input.c:6441 tcp_v4_do_rcv+0x98b/0xbf0 net/ipv4/tcp_ipv4.c:1931 tcp_v4_rcv+0x252a/0x2dc0 net/ipv4/tcp_ipv4.c:2374 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:239 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6079 [inline] __netif_receive_skb+0x143/0x380 net/core/dev.c:6192 process_backlog+0x31e/0x900 net/core/dev.c:6544 __napi_poll+0xb6/0x540 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x5f7/0xda0 net/core/dev.c:7784 handle_softirqs+0x22f/0x710 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] __local_bh_enable_ip+0x1a0/0x2e0 kernel/softirq.c:302 mptcp_pm_send_ack net/mptcp/pm.c:210 [inline] mptcp_pm_addr_send_ack+0x41f/0x500 net/mptcp/pm.c:-1 mptcp_pm_worker+0x174/0x320 net/mptcp/pm.c:1002 mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Allocated by task 44: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x1ef/0x6c0 mm/slub.c:5748 kmalloc_noprof include/linux/slab.h:957 [inline] mptcp_pm_alloc_anno_list+0x104/0x460 net/mptcp/pm.c:385 mptcp_pm_create_subflow_or_signal_addr+0xf9d/0x1360 net/mptcp/pm_kernel.c:355 mptcp_pm_nl_fully_established net/mptcp/pm_kernel.c:409 [inline] __mptcp_pm_kernel_worker+0x417/0x1ef0 net/mptcp/pm_kernel.c:1529 mptcp_pm_worker+0x1ee/0x320 net/mptcp/pm.c:1008 mptcp_worker+0xd5/0x1170 net/mptcp/protocol.c:2762 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 6630: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object m ---truncated---

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 4, 2025

Last Modified

October 19, 2026

Advisory Details (8)

Auto-updated Nov 7, 2026
Patch available.
Web page

SSA-253495

https://cert-portal.siemens.com/productcert/html/ssa-253495.html
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e2d1ad207174a7cd7903dd27a00db4b2dfa6c64b
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c602cc344b4b8d41515fec3ffa98457ac963ee12
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bbbd75346c8e6490b19c2ba90f38ea66ccf352b2
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9be29f8e7ce4e147e56caac2c3a0ce3573cf9c17
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6d3275d4ca62e2c02e1b7e8cd32db59df91c14b7
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/426358d9be7ce3518966422f87b96f1bad27295f
Web page

mptcp: fix a race in mptcp_pm_del_add_timer() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/385ddc0f008f24d1e7d03be998b3a98a37bd29ff

Vendor Advisories for CVE-2025-40257(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(28)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-realtime-5.15 (5.15.0.1102.106) @ jammy2026-11-03ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1094.98) @ jammy2026-11-03ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1044.46) @ jammy2026-11-03ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1008.9~24.04.1) @ noble2026-11-03ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1017.17) @ noble2026-11-03ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1052.58+fips1) @ noble2026-11-03ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1109.107) @ jammy2026-11-03ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1049.52.1) @ noble2026-11-03ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1103.93) @ jammy2026-11-03ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-19.19~24.04.2) @ noble2026-11-03ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-106.106~22.04.1) @ jammy2026-11-03ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1050.53~22.04.1) @ jammy2026-11-03ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1010.10) @ questing2026-11-03ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1052.55+fips1) @ noble2026-11-03ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1067 (5.15.0-1067.71) @ jammy2026-11-03ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1008.9) @ questing2026-11-03ubuntu
ubuntulinux-tools-gke-5.15 (5.15.0.1099.98) @ jammy2026-11-03ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1109.94) @ jammy2026-11-03ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1051.57) @ noble2026-11-03ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy2026-11-03ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2040.41) @ noble2026-11-03ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1097.95) @ jammy2026-11-03ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1110.119~20.04.1) @ focal2026-11-03ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1029.30) @ noble2026-11-03ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1045.46) @ noble2026-11-03ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1010.10) @ questing2026-11-03ubuntu
redhatkernel-0:6.12.0-211.7.1.el10_22026-05-19redhat
linuxKernel @ 5.10.247 (fixes >=5.10.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (47 versions)
  • every version up to 5.10.247-1: fixed in 5.10.247-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.158-1~deb11u1 (13 versions)
  • every version up to 6.1.159-1~deb11u1: fixed in 6.1.159-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (45 versions)
  • every version up to 6.1.159-1: fixed in 6.1.159-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.63-1~bpo12+1 (8 versions)
  • every version up to 6.12.63-1: fixed in 6.12.63-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.17.9-1 (83 versions)
  • every version up to 6.17.10-1: fixed in 6.17.10-1
—

Additional Vendor Advisories

(23)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 21× in last 7d / 88× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 333 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 233 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-11-13 14:09 UTCEchelonGraph re-scored
  3. 2026-11-13 14:09 UTCVendor advisory
  4. 2026-11-13 14:09 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-11-12 13:35 UTCEchelonGraph re-scored
  7. 2026-11-12 13:35 UTCVendor advisory
  8. 2026-11-12 13:35 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-11 16:36 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-11-11 13:04 UTCEchelonGraph re-scored
  11. 2026-11-11 13:04 UTCVendor advisory
  12. 2026-11-11 13:04 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-10 16:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-11-10 12:31 UTCEchelonGraph re-scored
  15. 2026-11-10 12:31 UTCVendor advisory
  16. 2026-11-10 12:31 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-11-09 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-11-09 11:59 UTCEchelonGraph re-scored
  19. 2026-11-09 11:59 UTCVendor advisory
  20. 2026-11-09 11:59 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-11-08 16:37 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-11-08 11:28 UTCEchelonGraph re-scored
  23. 2026-11-08 11:28 UTCVendor advisory
  24. 2026-11-08 11:28 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-07 16:36 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
Show 75 more
  1. 2026-11-07 10:57 UTCEchelonGraph re-scored
  2. 2026-11-07 10:57 UTCVendor advisory
  3. 2026-11-07 10:57 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-06 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-11-06 10:27 UTCEchelonGraph re-scored
  6. 2026-11-06 10:27 UTCVendor advisory
  7. 2026-11-06 10:26 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-11-05 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-11-05 12:55 UTCOSV refresh
  10. 2026-11-05 09:55 UTCEchelonGraph re-scored
  11. 2026-11-05 09:55 UTCVendor advisory
  12. 2026-11-05 09:55 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-04 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-11-04 09:24 UTCEchelonGraph re-scored
  15. 2026-11-04 09:24 UTCVendor advisory
  16. 2026-11-04 09:24 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-11-03 16:44 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-11-03 08:53 UTCEchelonGraph re-scored
  19. 2026-11-03 08:53 UTCVendor advisory
  20. 2026-11-03 08:52 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-11-02 16:42 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-11-02 08:21 UTCEchelonGraph re-scored
  23. 2026-11-02 08:21 UTCVendor advisory
  24. 2026-11-02 08:21 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-01 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  26. 2026-11-01 07:50 UTCEchelonGraph re-scored
  27. 2026-11-01 07:50 UTCVendor advisory
  28. 2026-11-01 07:50 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-31 07:19 UTCEchelonGraph re-scored
  30. 2026-10-31 07:19 UTCVendor advisory
  31. 2026-10-31 07:19 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  33. 2026-10-30 06:48 UTCEchelonGraph re-scored
  34. 2026-10-30 06:48 UTCVendor advisory
  35. 2026-10-30 06:47 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  36. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  37. 2026-10-29 06:17 UTCEchelonGraph re-scored
  38. 2026-10-29 06:17 UTCVendor advisory
  39. 2026-10-29 06:16 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  41. 2026-10-28 05:46 UTCEchelonGraph re-scored
  42. 2026-10-28 05:46 UTCVendor advisory
  43. 2026-10-28 05:45 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  44. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-10-27 05:14 UTCEchelonGraph re-scored
  46. 2026-10-27 05:14 UTCVendor advisory
  47. 2026-10-27 05:14 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  49. 2026-10-26 00:42 UTCEchelonGraph re-scored
  50. 2026-10-26 00:42 UTCVendor advisory
  51. 2026-10-26 00:41 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  53. 2026-10-25 16:28 UTCEchelonGraph re-scored
  54. 2026-10-25 00:07 UTCEchelonGraph re-scored
  55. 2026-10-25 00:07 UTCVendor advisory
  56. 2026-10-25 00:07 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  58. 2026-10-23 23:36 UTCEchelonGraph re-scored
  59. 2026-10-23 23:36 UTCVendor advisory
  60. 2026-10-23 23:36 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  62. 2026-10-22 23:01 UTCEchelonGraph re-scored
  63. 2026-10-22 23:01 UTCVendor advisory
  64. 2026-10-22 23:01 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  66. 2026-10-21 22:29 UTCEchelonGraph re-scored
  67. 2026-10-21 22:29 UTCVendor advisory
  68. 2026-10-21 22:29 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  70. 2026-10-20 21:58 UTCEchelonGraph re-scored
  71. 2026-10-20 21:58 UTCVendor advisory
  72. 2026-10-20 21:58 UTCGHSA enrichmentGHSA-q4wq-g3wm-gmfc · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  74. 2026-10-19 21:26 UTCEchelonGraph re-scored
  75. 2026-10-19 21:26 UTCVendor advisory

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Frequently asked(5)

What is CVE-2025-40257?
CVE-2025-40257 is a critical-severity vulnerability; its CVE record was published on December 4, 2025. In the Linux kernel, the following vulnerability has been resolved: mptcp: fix a race in mptcp_pm_del_add_timer() mptcp_pm_del_add_timer() can call sk_stop_timer_sync(sk, &entry->add_timer) while another might have free entry already, as reported by syzbot. Add RCU protection to fix this issue.…
When was the CVE record for CVE-2025-40257 published?
The CVE record for CVE-2025-40257 was published on December 4, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2025-40257 actively exploited?
CVE-2025-40257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-40257?
CVE-2025-40257 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-40257?
A fix for CVE-2025-40257 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-40257 are linked in the Vendor Advisories panel on this page.

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