CVE-2026-90256

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-90256

Key Details

CVE	CVE-2026-90256
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is adjacent; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-90256
CVE	https://www.cve.org/CVERecord?id=CVE-2026-90256

Source

Reference

NVD

CVE