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CVE-2026-90256

8.8 high Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 5

  1. StatusReceived → PublishedNVD modified 2026-10-21 12:50
  2. References+2 references (now 4)NVD modified 2026-10-21 13:20
  3. StatusPublished → ReceivedNVD modified 2026-10-21 13:20
  4. StatusReceived → PublishedNVD modified 2026-10-19 09:00
  5. First seenCVSS 8.8NVD modified 2026-10-19 09:19

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 4