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Back to active CVEs
High · CVSS 7.6CVE-2025-21994

ksmbd: fix incorrect validation for num_aces field of smb_aclCVE-2025-21994

Answer in brief

CVE-2025-21994 records a High severity (CVSS 7.6) vulnerability in ksmbd: fix incorrect validation for num_aces field of smb_acl. 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 Apr 2, 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 7.6
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.6. 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 <c3a3484d9d31b27a3db0fab91fcf191132d65236 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <9c4e202abff45f8eac17989e549fc7a75095f675 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <d0f87370622a853b57e851f7d5a5452b72300f19 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd || >=0626e6641f6b467447c81dd7678a69c66f7746cf <f6a6721802ac2f12f4c1bbe839a4c229b61866f2 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <1b8b67f3c5e5169535e26efedd3e422172e2db64c3a3484d9d31b27a3db0fab91fcf191132d65236, 9c4e202abff45f8eac17989e549fc7a75095f675, d0f87370622a853b57e851f7d5a5452b72300f19, a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd, f6a6721802ac2f12f4c1bbe839a4c229b61866f2, 1b8b67f3c5e5169535e26efedd3e422172e2db64
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 c3a3484d9d31b27a3db0fab91fcf191132d65236 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 2, 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 referencegit.kernel.org
  • Source referencelists.debian.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix incorrect validation for num_aces field of smb_acl parse_dcal() validate num_aces to allocate posix_ace_state_array. if (num_aces > ULONG_MAX / sizeof(struct smb_ace *)) It is an incorrect validation that we can create an array of size ULONG_MAX. smb_acl has ->size field to calculate actual number of aces in request buffer size. Use this to check invalid num_aces.

Quoted source text, attributed separately from HOL analysis.