CVE-2026-74540

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-74540

Key Details

CVE	CVE-2026-74540
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-16
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: fix UAF in l2cap_le_connect_rsp

l2cap_le_connect_rsp() obtains a channel via

__l2cap_get_chan_by_ident() but neither holds a reference nor uses

l2cap_chan_hold_unless_zero() before locking and operating on it.

A concurrent l2cap_chan_del() triggered by a remote disconnect can

free the channel between the lookup and l2cap_chan_lock(), causing

a use-after-free.

The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler

l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero()

to safely hold a reference, but l2cap_le_connect_rsp() was left

unprotected.

Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup

and l2cap_chan_put() on the exit path, consistent with other L2CAP

response handlers. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74540
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74540

Source

Reference

NVD

CVE