CVE-2022-49775

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-05-01. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

tcp: cdg: allow tcp_cdg_release() to be called multiple times

Apparently, mptcp is able to call tcp_disconnect() on an already disconnected flow. This is generally fine, unless current congestion control is CDG, because it might trigger a double-free [1]

Instead of fixing MPTCP, and future bugs, we can make tcp_disconnect() more resilient.

[1] BUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline] BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567

CPU: 0 PID: 3645 Comm: kworker/0:7 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: events mptcp_worker Call Trace:

__dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462 ____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xe2/0x580 mm/slub.c:4567 tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 __mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327 mptcp_do_fastclose net/mptcp/protocol.c:2592 [inline] mptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Allocated by task 3671: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc_array include/linux/slab.h:640 [inline] kcalloc include/linux/slab.h:671 [inline] tcp_cdg_init+0x10d/0x170 net/ipv4/tcp_cdg.c:380 tcp_init_congestion_control+0xab/0x550 net/ipv4/tcp_cong.c:193 tcp_reinit_congestion_control net/ipv4/tcp_cong.c:217 [inline] tcp_set_congestion_control+0x96c/0xaa0 net/ipv4/tcp_cong.c:391 do_tcp_setsockopt+0x505/0x2320 net/ipv4/tcp.c:3513 tcp_setsockopt+0xd4/0x100 net/ipv4/tcp.c:3801 mptcp_setsockopt+0x35f/0x2570 net/mptcp/sockopt.c:844 __sys_setsockopt+0x2d6/0x690 net/socket.c:2252 __do_sys_setsockopt net/socket.c:2263 [inline] __se_sys_setsockopt net/socket.c:2260 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2260 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 16: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xe2/0x580 mm/slub.c:4567 tcp_cleanup_congestion_control+0x70/0x120 net/ipv4/tcp_cong.c:226 tcp_v4_destroy_sock+0xdd/0x750 net/ipv4/tcp_ipv4.c:2254 tcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1969 inet_csk_destroy_sock+0x196/0x440 net/ipv4/inet_connection_sock.c:1157 tcp_done+0x23b/0x340 net/ipv4/tcp.c:4649 tcp_rcv_state_process+0x40e7/0x4990 net/ipv4/tcp_input.c:6624 tcp_v6_do_rcv+0x3fc/0x13c0 net/ipv6/tcp_ipv6.c:1525 tcp_v6_rcv+0x2e8e/0x3830 net/ipv6/tcp_ipv6.c:1759 ip6_protocol_deliver_rcu+0x2db/0x1950 net/ipv6/ip6_input.c:439 ip6_input_finish+0x14c/0x2c0 net/ipv6/ip6_input.c:484 NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip6_input+0x9c/0xd ---truncated---

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

May 1, 2025

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/72e560cb8c6f80fc2b4afc5d3634a32465e13a51
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1b639be27cbf428a5ca01dcf8b5d654194c956f8
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b49026d9c86f35a4c5bfb8d7345c9c4379828c6b
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35309be06b6feded2ab2cafbc2bca8534c2fa41e
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/78be2ee0112409ae4e9ee9e326151e0559b3d239
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9e481d87349d2282f400ee1d010a169c99f766b8
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4026033907cc6186d86b48daa4a252c860db2536
generic

tcp: cdg: allow tcp_cdg_release() to be called multiple times - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0b19171439016a8e4c97eafe543670ac86e2b8fe

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 4.9.334—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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (22 versions)5.10.158-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—6.0.10-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—6.0.10-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—6.0.10-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 153 total refreshes for this CVE.

  1. 2026-09-16 14:05 UTCEPSS rescore
  2. 2026-09-16 05:11 UTCEPSS rescore
  3. 2026-09-15 03:07 UTCEPSS rescore
  4. 2026-09-13 16:44 UTCEPSS rescore
  5. 2026-09-11 14:50 UTCEPSS rescore
  6. 2026-09-11 09:34 UTCEPSS rescore
  7. 2026-09-08 21:57 UTCEPSS rescore
  8. 2026-09-07 15:59 UTCEPSS rescore
  9. 2026-09-07 04:18 UTCOSV refresh
  10. 2026-09-06 13:45 UTCEPSS rescore
  11. 2026-09-05 15:25 UTCEPSS rescore
  12. 2026-09-04 13:57 UTCEPSS rescore
  13. 2026-09-04 05:04 UTCEPSS rescore
  14. 2026-09-02 14:09 UTCEPSS rescore
  15. 2026-09-01 13:51 UTCEPSS rescore
  16. 2026-08-30 19:15 UTCEPSS rescore
  17. 2026-08-30 01:19 UTCEPSS rescore
  18. 2026-08-28 21:38 UTCEPSS rescore
  19. 2026-08-27 14:22 UTCEPSS rescore
  20. 2026-08-26 14:43 UTCEPSS rescore
  21. 2026-08-23 00:17 UTCEPSS rescore
  22. 2026-08-21 23:46 UTCEPSS rescore
  23. 2026-08-20 22:53 UTCEPSS rescore
  24. 2026-08-20 14:01 UTCOSV refresh
  25. 2026-08-19 17:01 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 13:45 UTCEPSS rescore
  2. 2026-08-17 13:44 UTCEPSS rescore
  3. 2026-08-16 14:53 UTCEPSS rescore
  4. 2026-08-16 02:12 UTCEPSS rescore
  5. 2026-08-15 01:27 UTCEPSS rescore
  6. 2026-08-13 21:58 UTCEPSS rescore
  7. 2026-08-12 13:48 UTCEPSS rescore
  8. 2026-08-09 13:44 UTCEPSS rescore
  9. 2026-08-09 13:44 UTCEPSS rescore
  10. 2026-08-08 16:34 UTCEPSS rescore
  11. 2026-08-07 16:24 UTCEPSS rescore
  12. 2026-08-06 13:44 UTCEPSS rescore
  13. 2026-08-05 19:15 UTCEPSS rescore
  14. 2026-08-05 09:29 UTCEG score recompute
  15. 2026-08-05 09:29 UTCGHSA enrichment
  16. 2026-08-04 15:07 UTCEPSS rescore
  17. 2026-08-04 11:05 UTCEG score recompute
  18. 2026-08-04 11:05 UTCGHSA enrichment
  19. 2026-08-04 10:35 UTCEPSS rescore
  20. 2026-08-04 09:44 UTCEG score recompute
  21. 2026-08-04 09:44 UTCGHSA enrichment
  22. 2026-08-03 10:33 UTCEPSS rescore
  23. 2026-08-02 02:24 UTCEPSS rescore
  24. 2026-08-01 04:13 UTCEPSS rescore
  25. 2026-08-01 04:13 UTCEPSS rescore
  26. 2026-07-30 16:25 UTCEPSS rescore
  27. 2026-07-30 01:28 UTCEPSS rescore
  28. 2026-07-28 15:34 UTCEPSS rescore
  29. 2026-07-26 14:52 UTCEPSS rescore
  30. 2026-07-26 14:52 UTCEPSS rescore
  31. 2026-07-25 14:16 UTCEPSS rescore
  32. 2026-07-24 14:15 UTCEPSS rescore
  33. 2026-07-24 07:41 UTCOSV refresh
  34. 2026-07-23 14:16 UTCEPSS rescore
  35. 2026-07-23 14:16 UTCEPSS rescore
  36. 2026-07-23 02:16 UTCEG score recompute
  37. 2026-07-22 23:04 UTCEG score recompute
  38. 2026-07-22 14:06 UTCEPSS rescore
  39. 2026-07-22 14:06 UTCEPSS rescore
  40. 2026-07-21 15:23 UTCEPSS rescore
  41. 2026-07-21 15:23 UTCEPSS rescore
  42. 2026-07-20 17:05 UTCEPSS rescore
  43. 2026-07-19 14:29 UTCEPSS rescore
  44. 2026-07-19 14:29 UTCEPSS rescore
  45. 2026-07-19 02:27 UTCEPSS rescore
  46. 2026-07-19 02:27 UTCEPSS rescore
  47. 2026-07-18 10:03 UTCEPSS rescore
  48. 2026-07-18 10:03 UTCEPSS rescore
  49. 2026-07-16 17:00 UTCEPSS rescore
  50. 2026-07-15 16:56 UTCEPSS rescore
  51. 2026-07-15 16:56 UTCEPSS rescore
  52. 2026-07-15 01:58 UTCEPSS rescore
  53. 2026-07-15 01:58 UTCEPSS rescore
  54. 2026-07-13 22:28 UTCEPSS rescore
  55. 2026-07-13 22:28 UTCEPSS rescore
  56. 2026-07-13 06:11 UTCEPSS rescore
  57. 2026-07-13 06:11 UTCEPSS rescore
  58. 2026-07-12 05:44 UTCEPSS rescore
  59. 2026-07-11 08:25 UTCEPSS rescore
  60. 2026-07-11 08:25 UTCEPSS rescore
  61. 2026-07-09 19:08 UTCEPSS rescore
  62. 2026-07-08 15:13 UTCEPSS rescore
  63. 2026-07-07 13:44 UTCEPSS rescore
  64. 2026-07-07 03:21 UTCOSV refresh
  65. 2026-07-06 16:25 UTCEPSS rescore
  66. 2026-07-05 02:28 UTCEPSS rescore
  67. 2026-07-04 06:29 UTCEPSS rescore
  68. 2026-07-01 15:04 UTCEPSS rescore
  69. 2026-06-30 23:21 UTCEPSS rescore
  70. 2026-06-30 23:20 UTCEPSS rescore
  71. 2026-06-29 14:04 UTCEPSS rescore
  72. 2026-06-28 14:06 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-28 04:54 UTCEPSS rescore
  75. 2026-06-27 03:07 UTCEPSS rescore

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2022-49775?
CVE-2022-49775 is a high vulnerability published on May 1, 2025. In the Linux kernel, the following vulnerability has been resolved: tcp: cdg: allow tcpcdgrelease() to be called multiple times Apparently, mptcp is able to call tcp_disconnect() on an already disconnected flow. This is generally fine, unless current congestion control is CDG, because it might…
When was CVE-2022-49775 disclosed?
CVE-2022-49775 was first published in the National Vulnerability Database on May 1, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-49775 actively exploited?
CVE-2022-49775 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.4% of all scored CVEs.
What is the CVSS score of CVE-2022-49775?
CVE-2022-49775 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2022-49775?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-49775, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-49775

Explore →

Is Your Infrastructure Affected by CVE-2022-49775?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs