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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-43020

Bluetooth: MGMT: validate LTK enc_size on loadCVE-2026-43020

Answer in brief

CVE-2026-43020 records a Unknown severity vulnerability in Bluetooth: MGMT: validate LTK enc_size on load. 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 1, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 6, 2026
References
8 linked sources
Open source record

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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>=346af67b8d116f01ef696fd47959a55deb2db8b6 <0f37d1e65c6d71ad94ccfb5c602163c525db789d || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <257cdb960d8ff6d60bb6461b03c814b6cf0c9e64 || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <c34577f517b556fb6ca173d45bf7e766ae2564ce || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <f71695e81f4cb428f3c7e2138eae88199005b52c || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <82f342b3b006ca1d65f4890c05f2ec32fcb808b6 || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257 || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009 || >=346af67b8d116f01ef696fd47959a55deb2db8b6 <b8dbe9648d69059cfe3a28917bfbf7e61efd7f150f37d1e65c6d71ad94ccfb5c602163c525db789d, 257cdb960d8ff6d60bb6461b03c814b6cf0c9e64, c34577f517b556fb6ca173d45bf7e766ae2564ce, f71695e81f4cb428f3c7e2138eae88199005b52c, 82f342b3b006ca1d65f4890c05f2ec32fcb808b6, 50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257, 40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009, b8dbe9648d69059cfe3a28917bfbf7e61efd7f15
Linux/Linuxgeneric3.4Not 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 0f37d1e65c6d71ad94ccfb5c602163c525db789d if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 1, 2026

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

  2. Source modified

    Nov 6, 2026

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

  3. First seen by HOL

    Nov 6, 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
  • 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: Bluetooth: MGMT: validate LTK enc_size on load Load Long Term Keys stores the user-provided enc_size and later uses it to size fixed-size stack operations when replying to LE LTK requests. An enc_size larger than the 16-byte key buffer can therefore overflow the reply stack buffer. Reject oversized enc_size values while validating the management LTK record so invalid keys never reach the stored key state.

Quoted source text, attributed separately from HOL analysis.