High 8.8Published Sep 17, 2026

CVE-2026-90256Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind

Updated under an hour ago (Oct 27, 2026, 6:50 AM ET)

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from efc30877bd4bc85fefe98d80af60fafc86e5775e before 0fa448369c87e20b2aeaeaca0187d698dd61f791; from f87271d21dd4ee83857ca11b94e7b4952749bbae before 7c032b6d48a46634cbd58aaebad2638c00ad3b51; from ab4eedb790cae44313759b50fe47da285e2519d5 before b495a3a9b33bc4e4613e685bf5c96c136caa22d8; from ab4eedb790cae44313759b50fe47da285e2519d5 before 2b66c83ff1751d6bd3201b3017206262ab46dc05; 18ab6b6078fa8191ca30a3065d57bf35d5635761; from 6.6.84 before 6.6.160; from 6.12.20 before 6.12.114; from 6.13.8 before 6.14	CNA record

References

References

https://git.kernel.org/stable/c/0fa448369c87e20b2aeaeaca0187d698dd61f791
https://git.kernel.org/stable/c/7c032b6d48a46634cbd58aaebad2638c00ad3b51
https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8
https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.