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Back to active CVEs
Critical · CVSS 9.8CVE-2026-45972

smb: client: fix potential UAF and double free in smb2_open_file()CVE-2026-45972

Answer in brief

CVE-2026-45972 records a Critical severity (CVSS 9.8) vulnerability in smb: client: fix potential UAF and double free in smb2_open_file(). The current sources do not mark it as known exploited. The current feed maps Red Hat/kernel (generic), Red Hat/kernel-rt (generic), 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 27, 2026Updated Oct 19, 2026Source checked Nov 3, 2026First seen by HOL Jul 15, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
6 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 Red Hat/kernel (generic), Red Hat/kernel-rt (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/kernelgeneric*Not reported
Red Hat/kernel-rtgeneric*Not reported
Linux/Linuxgeneric>=743f70406264348c0830f38409eb6c40a42fb2db <96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74 || >=3a6d6b332f92990958602c1e35ce0173e2dd62e9 <7425453ea16dbc3bbb0f6cac4d60b537e5e4d151 || >=b64e3b5d8d759dd4333992e4ba4dadf9359952c8 <4d339b219004869e96c4ce56b8891f83a38da4c0 || >=9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 <e66dcf7bb9c4df5582c82bc3582725abcbfbea73 || >=e3a43633023e3cacaca60d4b8972d084a2b06236 <639deb962986ef2f5e2a6d5a600c66f922471e81 || >=e3a43633023e3cacaca60d4b8972d084a2b06236 <ebbbc4bfad4cb355d17c671223d0814ee3ef4eda || >=6.1.163 <6.1.165 || >=6.6.124 <6.6.128 || >=6.12.70 <6.12.75 || >=6.18.10 <6.18.1496e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74, 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151, 4d339b219004869e96c4ce56b8891f83a38da4c0, e66dcf7bb9c4df5582c82bc3582725abcbfbea73, 639deb962986ef2f5e2a6d5a600c66f922471e81, ebbbc4bfad4cb355d17c671223d0814ee3ef4eda, 6.1.165, 6.6.128, 6.12.75, 6.18.14
Linux/Linuxgeneric6.19Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/kernel, Red Hat/kernel-rt, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 27, 2026

    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

    Jul 15, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • 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 referencesecurity.access.redhat.com
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416, CWE-825
Source
CVE List V5
Source checked
Nov 3, 2026
References
9 linked sources
Open source record