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Back to active CVEs
Critical · CVSS 9.8CVE-2025-21748

ksmbd: fix integer overflows on 32 bit systemsCVE-2025-21748

Answer in brief

CVE-2025-21748 records a Critical severity (CVSS 9.8) vulnerability in ksmbd: fix integer overflows on 32 bit systems. 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 Feb 27, 2025Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026
Upstream Advisory

Record context

Vulnerability class
Memory Corruption
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
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. 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/Linuxgeneric>=0626e6641f6b467447c81dd7678a69c66f7746cf <f3b9fb2764591d792d160f375851013665a9e820 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <760568c1f62ea874e8fb492f9cfa4f47b4b8391e || >=0626e6641f6b467447c81dd7678a69c66f7746cf <82f59d64e6297f270311b16b5dcf65be406d1ea3 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <b4b902737746c490258de5cb55cab39e79927a67 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <ecb9947fa7c99a77b04d43404c6988a0d326e4a0 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <aab98e2dbd648510f8f51b83fbf4721206ccae45f3b9fb2764591d792d160f375851013665a9e820, 760568c1f62ea874e8fb492f9cfa4f47b4b8391e, 82f59d64e6297f270311b16b5dcf65be406d1ea3, b4b902737746c490258de5cb55cab39e79927a67, ecb9947fa7c99a77b04d43404c6988a0d326e4a0, aab98e2dbd648510f8f51b83fbf4721206ccae45
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 f3b9fb2764591d792d160f375851013665a9e820 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Feb 27, 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 integer overflows on 32 bit systems On 32bit systems the addition operations in ipc_msg_alloc() can potentially overflow leading to memory corruption. Add bounds checking using KSMBD_IPC_MAX_PAYLOAD to avoid overflow.

Quoted source text, attributed separately from HOL analysis.