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Back to active CVEs
High · CVSS 8.8CVE-2025-37899

ksmbd: fix use-after-free in session logoffCVE-2025-37899

Answer in brief

CVE-2025-37899 records a High severity (CVSS 8.8) vulnerability in ksmbd: fix use-after-free in session logoff. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 20, 2025Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 4, 2026
References
7 linked sources
Open source record

Key facts

Risk
High · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric5.15Not reported
Linux/Linuxgeneric>=0626e6641f6b467447c81dd7678a69c66f7746cf <931dc8a3670f71c45c0b1379ea4e92dafbda1aca || >=0626e6641f6b467447c81dd7678a69c66f7746cf <70ad6455139e26e85f48f95d0e21f351c1909342 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <d5ec1d79509b3ee01de02c236f096bc050221b7f || >=0626e6641f6b467447c81dd7678a69c66f7746cf <02d16046cd11a5c037b28c12ffb818c56dd3ef43 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <2fc9feff45d92a92cd5f96487655d5be23fb7e2b931dc8a3670f71c45c0b1379ea4e92dafbda1aca, 70ad6455139e26e85f48f95d0e21f351c1909342, d5ec1d79509b3ee01de02c236f096bc050221b7f, 02d16046cd11a5c037b28c12ffb818c56dd3ef43, 2fc9feff45d92a92cd5f96487655d5be23fb7e2b

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 931dc8a3670f71c45c0b1379ea4e92dafbda1aca if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 20, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencenews.ycombinator.com
  • Source referencesean.heelan.io
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.

Quoted source text, attributed separately from HOL analysis.