CVE-2026-90256
CVE CVE-2026-90256EUVD EUVD-2026-81849Published 2026-09-17T16:07:55.000ZLast changed 2026-09-18T17:54:12.000ZCVSS 8.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux f87271d21dd4ee83857ca11b94e7b4952749bbae; patch: 7.2.6; 18ab6b6078fa8191ca30a3065d57bf35d5635761; patch: 0; 6.12.20 <6.13; ab4eedb790cae44313759b50fe47da285e2519d5 <b495a3a9b33bc4e4613e685bf5c96c136caa22d8; efc30877bd4bc85fefe98d80af60fafc86e5775e; ab4eedb790cae44313759b50fe47da285e2519d5 <2b66c83ff1751d6bd3201b3017206262ab46dc05; patch: 7.3-rc1; 6.13.8 <6.14; 6.14; 6.6.84 <6.7
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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