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Back to active CVEs
High · CVSS 8.8CVE-2026-90256

Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_indCVE-2026-90256

Answer in brief

CVE-2026-90256 records a High severity (CVSS 8.8) vulnerability in Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (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 Sep 17, 2026Updated Oct 21, 2026Source checked Nov 1, 2026First seen by HOL Sep 17, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.8. 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=ab4eedb790cae44313759b50fe47da285e2519d5 <b495a3a9b33bc4e4613e685bf5c96c136caa22d8 || >=ab4eedb790cae44313759b50fe47da285e2519d5 <2b66c83ff1751d6bd3201b3017206262ab46dc05 || efc30877bd4bc85fefe98d80af60fafc86e5775e || f87271d21dd4ee83857ca11b94e7b4952749bbae || 18ab6b6078fa8191ca30a3065d57bf35d5635761 || >=6.6.84 <6.7 || >=6.12.20 <6.13 || >=6.13.8 <6.14b495a3a9b33bc4e4613e685bf5c96c136caa22d8, 2b66c83ff1751d6bd3201b3017206262ab46dc05, 6.7, 6.13, 6.14
Linux/Linuxgeneric6.14Not reported
Linux/Linuxgeneric>=efc30877bd4bc85fefe98d80af60fafc86e5775e <0fa448369c87e20b2aeaeaca0187d698dd61f791 || >=f87271d21dd4ee83857ca11b94e7b4952749bbae <7c032b6d48a46634cbd58aaebad2638c00ad3b51 || >=ab4eedb790cae44313759b50fe47da285e2519d5 <b495a3a9b33bc4e4613e685bf5c96c136caa22d8 || >=ab4eedb790cae44313759b50fe47da285e2519d5 <2b66c83ff1751d6bd3201b3017206262ab46dc05 || 18ab6b6078fa8191ca30a3065d57bf35d5635761 || >=6.6.84 <6.6.160 || >=6.12.20 <6.12.114 || >=6.13.8 <6.140fa448369c87e20b2aeaeaca0187d698dd61f791, 7c032b6d48a46634cbd58aaebad2638c00ad3b51, b495a3a9b33bc4e4613e685bf5c96c136caa22d8, 2b66c83ff1751d6bd3201b3017206262ab46dc05, 6.6.160, 6.12.114, 6.14

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to b495a3a9b33bc4e4613e685bf5c96c136caa22d8; Linux/Linux to 0fa448369c87e20b2aeaeaca0187d698dd61f791 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

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

  2. Source modified

    Oct 21, 2026

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

  3. First seen by HOL

    Sep 17, 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: Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind hci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via hci_conn_timeout (disc_work) -> hci_proto_disconn_ind -> l2cap_disconn_ind. This is UAF if the l2cap_conn is deleted concurrently. disc_work is disabled sync in hci_conn_del(), so we cannot take hci_dev_lock in disc_work. Fix by using proto_lock to guard l2cap_data, in addition to hdev->lock which is held in other access paths.

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 1, 2026
References
4 linked sources
Open source record