CVE-2025-38561

HIGHNVD 4.78.5
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 8.5 from GitHub Security Advisory (severity: HIGH) published 2025-08-19. NVD baseline CVSS 4.7; sources differ by 3.8.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2025-26504 (ENISA EUVD) · GHSA-6mwh-579p-fgpg (GitHub Security Advisories)Source: ENISA EUVD

8.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

ksmbd: fix Preauh_HashValue race condition

If client send multiple session setup requests to ksmbd, Preauh_HashValue race condition could happen. There is no need to free sess->Preauh_HashValue at session setup phase. It can be freed together with session at connection termination phase.

CVSS v3
4.7
EG Score
8.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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)
Severity85% × 45%
Impact severity (EG Severity): CVSS 8.5 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 SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (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 (8.5): severity, escalated by confirmed exploitation. This CVE's 8.5 is its impact severity (EG Severity), not escalated.

EG Severity
8.5 HIGHCVSS-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 (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (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 Vulnrichment) · Technical impact total (CISA Vulnrichment). 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

August 19, 2025

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Aug 5, 2026
Patch available.
Web page

ZDI-25-916 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-25-916/
Web page

ksmbd: fix Preauh_HashValue race condition - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6
Web page

ksmbd: fix Preauh_HashValue race condition - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6613887da1d18dd2ecfd6c6148a873c4d903ebdc
Web page

ksmbd: fix Preauh_HashValue race condition - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc
Web page

ksmbd: fix Preauh_HashValue race condition - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/edeecc7871e8fc0878d53ce286c75040a0e38f6c
Web page

ksmbd: fix Preauh_HashValue race condition - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b69fd87076daa66f3d186bd421a7b0ee0cb45829
Web page

ksmbd: fix Preauh_HashValue race condition - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fbf5c0845ed15122a770bca9be1d9b60b470d3aa

Vendor Advisories for CVE-2025-38561(1)

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

Patch Availability(21)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy2026-10-31ubuntu
ubuntulinux-virtual-6.8 (6.8.0-94.96) @ noble2026-10-31ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.14.0-36.36) @ plucky2026-10-31ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.14.0-1016.16~24.04.1) @ noble2026-10-31ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1045.48.1) @ noble2026-10-31ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.168.159) @ jammy2026-10-31ubuntu
ubuntulinux-tools-realtime-5.15 (5.15.0.1098.102) @ jammy2026-10-31ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1046.49+fips1) @ noble2026-10-31ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1063 (5.15.0-1063.67) @ jammy2026-10-31ubuntu
ubuntulinux-tools-ibm-lts-24.04 (6.8.0-1043.43) @ noble2026-10-31ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1022.23) @ noble2026-10-31ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1046.52+fips1) @ noble2026-10-31ubuntu
ubuntuoracle-5.15 (5.15.0-1055) @ focal2026-10-31ubuntu
ubuntulinux-tools-azure-6.14 (6.14.0-1017.17) @ plucky2026-10-31ubuntu
ubuntulinux-tools-oracle-edge (6.14.0-1017.17~24.04.1) @ noble2026-10-31ubuntu
ubuntulinux-tools-oem-6.14 (6.14.0-1016.16) @ noble2026-10-31ubuntu
ubuntulinux-tools-raspi-6.14 (6.14.0-1018.18) @ plucky2026-10-31ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1099.89) @ jammy2026-10-31ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1040.41) @ noble2026-10-31ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1046.52) @ noble2026-10-31ubuntu
linuxKernel @ 6.1.148 (fixes >=5.15.0)—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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.148-1~deb11u1 (11 versions)
  • every version up to 6.1.153-1~deb11u1: fixed in 6.1.153-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (42 versions)
  • every version up to 6.1.148-1: fixed in 6.1.148-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1, 6.12.41-1, 6.12.43-1~bpo12+1
  • every version up to 6.12.43-1: fixed in 6.12.43-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.16~rc7-1~exp1 (62 versions)
  • every version up to 6.16.3-1: fixed in 6.16.3-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(20)

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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 221 rows on record for this CVE, as 99 entries (1 repeat merged).

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. 1 repeat row among the latest 100 is merged into the row it repeats. The 121 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 02:07 UTCEchelonGraph re-scored
  3. 2026-11-13 02:07 UTCGHSA enrichmentGHSA-6mwh-579p-fgpg · GitHub severity HIGH · GitHub CVSS 8.5
  4. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-11-11 16:36 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-11-10 16:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-11-09 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-11-08 16:37 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  9. 2026-11-07 16:36 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  10. 2026-11-06 17:48 UTCEchelonGraph re-scored
  11. 2026-11-06 17:48 UTCVendor advisory
  12. 2026-11-06 17:48 UTCGHSA enrichmentGHSA-6mwh-579p-fgpg · GitHub severity HIGH · GitHub CVSS 8.5
  13. 2026-11-06 16:34 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  14. 2026-11-05 16:35 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  15. 2026-11-04 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  16. 2026-11-03 16:44 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  17. 2026-11-02 16:42 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  18. 2026-11-01 16:32 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  19. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  20. 2026-10-31 09:30 UTCEchelonGraph re-scored
  21. 2026-10-31 09:30 UTCVendor advisory
  22. 2026-10-31 09:30 UTCGHSA enrichmentGHSA-6mwh-579p-fgpg · GitHub severity HIGH · GitHub CVSS 8.5
  23. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  24. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  25. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
Show 74 more
  1. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  2. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  3. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  4. 2026-10-25 16:30 UTCEchelonGraph re-scored
  5. 2026-10-25 01:12 UTCEchelonGraph re-scored
  6. 2026-10-25 01:12 UTCVendor advisory
  7. 2026-10-25 01:11 UTCGHSA enrichmentGHSA-6mwh-579p-fgpg · GitHub severity HIGH · GitHub CVSS 8.5
  8. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  9. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  10. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  11. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  12. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  14. 2026-10-18 16:54 UTCEchelonGraph re-scored
  15. 2026-10-18 16:54 UTCVendor advisory
  16. 2026-10-18 16:54 UTCGHSA enrichmentGHSA-6mwh-579p-fgpg · GitHub severity HIGH · GitHub CVSS 8.5
  17. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-18 05:35 UTCEchelonGraph re-scored
  19. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-16 16:38 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-13 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-12 17:07 UTCEchelonGraph re-scored
  25. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  26. 2026-10-11 20:40 UTCEchelonGraph re-scored
  27. 2026-10-11 18:51 UTCEchelonGraph re-scored
  28. 2026-10-11 15:28 UTCEchelonGraph re-scored
  29. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  30. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  31. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  32. 2026-10-08 17:09 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  33. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  34. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  35. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  36. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  37. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  38. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  39. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  40. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  41. 2026-09-27 02:45 UTCOSV refresh
  42. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  43. 2026-09-26 00:24 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  44. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  45. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  46. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  47. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  48. 2026-09-17 19:29 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  49. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  50. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  51. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  52. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  53. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  54. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  55. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  56. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  57. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  58. 2026-09-07 11:48 UTCOSV refresh
  59. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  60. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  61. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  62. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  63. 2026-09-01 04:38 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  64. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  65. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  66. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  67. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  68. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  69. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  70. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  71. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  72. 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  73. 2026-08-20 20:31 UTCOSV refresh
  74. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile

Frequently asked(5)

What is CVE-2025-38561?
CVE-2025-38561 is a high-severity vulnerability; its CVE record was published on August 19, 2025. In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Preauh_HashValue race condition If client send multiple session setup requests to ksmbd, Preauh_HashValue race condition could happen. There is no need to free sess->Preauh_HashValue at session setup phase. It can be…
When was the CVE record for CVE-2025-38561 published?
The CVE record for CVE-2025-38561 was published on August 19, 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 August 5, 2026; the record at its source may have been updated since.
Is CVE-2025-38561 actively exploited?
CVE-2025-38561 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-2025-38561?
CVE-2025-38561 has a CVSS v3 base score of 4.7 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 8.5 (HIGH).
How do I remediate CVE-2025-38561?
A fix for CVE-2025-38561 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-38561 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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