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Back to active CVEs
High · CVSS 8.2CVE-2023-54250

ksmbd: avoid out of bounds access in decode_preauth_ctxt()CVE-2023-54250

Answer in brief

CVE-2023-54250 records a High severity (CVSS 8.2) vulnerability in ksmbd: avoid out of bounds access in decode_preauth_ctxt(). 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 Dec 30, 2025Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.2
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.2. 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>=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <39f5b4b313b445c980a2a295bed28228c29228ed || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a2f6ded41bec1d3be643c80a5eb97f1680309001 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <f02edb9debbd36f44efa7567031485892c7df60d || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <e7067a446264a7514fa1cfaa4052cdb6803bc6a239f5b4b313b445c980a2a295bed28228c29228ed, a2f6ded41bec1d3be643c80a5eb97f1680309001, f02edb9debbd36f44efa7567031485892c7df60d, e7067a446264a7514fa1cfaa4052cdb6803bc6a2
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 39f5b4b313b445c980a2a295bed28228c29228ed if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Dec 30, 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
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: avoid out of bounds access in decode_preauth_ctxt() Confirm that the accessed pneg_ctxt->HashAlgorithms address sits within the SMB request boundary; deassemble_neg_contexts() only checks that the eight byte smb2_neg_context header + (client controlled) DataLength are within the packet boundary, which is insufficient. Checking for sizeof(struct smb2_preauth_neg_context) is overkill given that the type currently assumes SMB311_SALT_SIZE bytes of trailing Salt.

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
4 linked sources
Open source record