Vulnerability details
CVE-2026-90256
Linux Linux
Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVSS 3.1
8.8High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 18ab6b6078fa8191ca30a3065d57bf35d5635761 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.14 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.12.20 ≤ v < 6.12.114 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.13.8 ≤ v < 6.14 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 6.6.84 ≤ v < 6.6.160 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ab4eedb790cae44313759b50fe47da285e2519d5 ≤ v < b495a3a9b33bc4e4613e685bf5c96c136caa22d8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ab4eedb790cae44313759b50fe47da285e2519d5 ≤ v < 2b66c83ff1751d6bd3201b3017206262ab46dc05 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | efc30877bd4bc85fefe98d80af60fafc86e5775e ≤ v < 0fa448369c87e20b2aeaeaca0187d698dd61f791 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f87271d21dd4ee83857ca11b94e7b4952749bbae ≤ v < 7c032b6d48a46634cbd58aaebad2638c00ad3b51 | CVEProject cvelistV5 (CNA) |
References and advisories
4
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Details
- Published
- 2026-09-17
- Last updated
- 2026-10-21
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.31%
Probability of exploitation in 30 days
24.9%
Percentile (among all CVEs)
Weaknesses (CWE)
- —