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Back to active CVEs
High · CVSS 7.5CVE-2025-38191

ksmbd: fix null pointer dereference in destroy_previous_sessionCVE-2025-38191

Answer in brief

CVE-2025-38191 records a High severity (CVSS 7.5) vulnerability in ksmbd: fix null pointer dereference in destroy_previous_session. 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 Jul 4, 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 7.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. 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/Linuxgeneric>=0626e6641f6b467447c81dd7678a69c66f7746cf <281afc52e2961cd5dd8326ebc9c5bc40904c0468 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <0902625a24eea7fdc187faa5d97df244d159dd6e || >=0626e6641f6b467447c81dd7678a69c66f7746cf <1193486dffb7432a09f57f5d09049b4d4123538b || >=0626e6641f6b467447c81dd7678a69c66f7746cf <076f1adefb9837977af7ed233883842ddc446644 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e281afc52e2961cd5dd8326ebc9c5bc40904c0468, 0902625a24eea7fdc187faa5d97df244d159dd6e, 1193486dffb7432a09f57f5d09049b4d4123538b, 076f1adefb9837977af7ed233883842ddc446644, 7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e
Linux/Linuxgeneric5.15Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 281afc52e2961cd5dd8326ebc9c5bc40904c0468 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jul 4, 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 referencelists.debian.org
  • Source referencezerodayinitiative.com
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in destroy_previous_session If client set ->PreviousSessionId on kerberos session setup stage, NULL pointer dereference error will happen. Since sess->user is not set yet, It can pass the user argument as NULL to destroy_previous_session. sess->user will be set in ksmbd_krb5_authenticate(). So this patch move calling destroy_previous_session() after ksmbd_krb5_authenticate().

Quoted source text, attributed separately from HOL analysis.