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Back to active CVEs
Critical · CVSS 9.8CVE-2026-31609

smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()CVE-2026-31609

Answer in brief

CVE-2026-31609 records a Critical severity (CVSS 9.8) vulnerability in smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush(). 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 24, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

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>=cca0526ef2344cab6944d7f441fc24e152da031b <a9940dcbe5cb92482c04efc7341039ddf7dbf607 || >=37b5c06956183b65e6808b509cf637632016cdf7 <22b7c1c619d808aec4cad3dc42103345e370d107 || >=21538121efe6c8c5b51c742fa02cbe820bc48714 <f9a162c2bbcd0ac85bd07c5b37cf20286048b65c || >=21538121efe6c8c5b51c742fa02cbe820bc48714 <27b7c3e916218b5eb2ee350211140e961bfc49be || >=6.18.11 <6.18.24 || >=6.19.1 <6.19.14a9940dcbe5cb92482c04efc7341039ddf7dbf607, 22b7c1c619d808aec4cad3dc42103345e370d107, f9a162c2bbcd0ac85bd07c5b37cf20286048b65c, 27b7c3e916218b5eb2ee350211140e961bfc49be, 6.18.24, 6.19.14
Linux/Linuxgeneric7.0Not 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 a9940dcbe5cb92482c04efc7341039ddf7dbf607 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 24, 2026

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

  2. Source modified

    Oct 16, 2026

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

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • 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: smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush() smbd_send_batch_flush() already calls smbd_free_send_io(), so we should not call it again after smbd_post_send() moved it to the batch list.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 16, 2026
References
4 linked sources
Open source record