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  4. CVE 2025 40099 cifs parsedfsreferrals prevent oob on malformed
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Back to active CVEs
Critical · CVSS 9.4CVE-2025-40099

cifs: parse_dfs_referrals: prevent oob on malformed inputCVE-2025-40099

Answer in brief

CVE-2025-40099 records a Critical severity (CVSS 9.4) vulnerability in cifs: parse_dfs_referrals: prevent oob on malformed input. 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 Oct 30, 2025Updated Oct 19, 2026Source checked Nov 3, 2026First seen by HOL Aug 5, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.4. 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>=4ecce920e13ace16a5ba45efe8909946c28fb2ad <cfacc7441f760e4a73cc71b6ff1635261d534657 || >=4ecce920e13ace16a5ba45efe8909946c28fb2ad <15c73964da9df994302f579ed14ee5fdbce7a332 || >=4ecce920e13ace16a5ba45efe8909946c28fb2ad <8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058 || >=4ecce920e13ace16a5ba45efe8909946c28fb2ad <bb0f2e66e1ac043a5b238f5bcab4f26f3c317039 || >=4ecce920e13ace16a5ba45efe8909946c28fb2ad <6447b0e355562a1ff748c4a2ffb89aae7e84d2c9cfacc7441f760e4a73cc71b6ff1635261d534657, 15c73964da9df994302f579ed14ee5fdbce7a332, 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058, bb0f2e66e1ac043a5b238f5bcab4f26f3c317039, 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9
Linux/Linuxgeneric4.11Not 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 cfacc7441f760e4a73cc71b6ff1635261d534657 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 30, 2025

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

  2. Source modified

    Oct 19, 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
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: cifs: parse_dfs_referrals: prevent oob on malformed input Malicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS - reply smaller than sizeof(struct get_dfs_referral_rsp) - reply with number of referrals smaller than NumberOfReferrals in the header Processing of such replies will cause oob. Return -EINVAL error on such replies to prevent oob-s.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 3, 2026
References
5 linked sources
Open source record