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Back to active CVEs
Critical · CVSS 9.8CVE-2026-43379

ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()CVE-2026-43379

Answer in brief

CVE-2026-43379 records a Critical severity (CVSS 9.8) vulnerability in ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close(). 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 May 8, 2026Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 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>=27b40b7bfcd121fe13a150ffe11957630cf49246 <bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 || >=5fb282ba4fef8985a5acf2b32681f2ec07732561 <960699317d39f46611f4ebeb69edc567c1f4e6b6 || >=5fb282ba4fef8985a5acf2b32681f2ec07732561 <dbbd328cf58261ca239756fe1c0d10c9518d3399 || >=5fb282ba4fef8985a5acf2b32681f2ec07732561 <b3568347c51c46e2cabc356bc34676df98296619 || >=5fb282ba4fef8985a5acf2b32681f2ec07732561 <eac3361e3d5dd8067b3258c69615888eb45e9f25 || >=6.6.32 <6.6.130bf4d66d72e4a9e268c1012c331ce9eaedb5e2086, 960699317d39f46611f4ebeb69edc567c1f4e6b6, dbbd328cf58261ca239756fe1c0d10c9518d3399, b3568347c51c46e2cabc356bc34676df98296619, eac3361e3d5dd8067b3258c69615888eb45e9f25, 6.6.130
Linux/Linuxgeneric6.9Not 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 bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 8, 2026

    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
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close() opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being accessed after rcu_read_unlock() has been called. This creates a race condition where the memory could be freed by a concurrent writer between the unlock and the subsequent pointer dereferences (opinfo->is_lease, etc.), leading to a use-after-free.

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 4, 2026
References
5 linked sources
Open source record