CVE-2026-23461

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-23461

Key Details

CVE	CVE-2026-23461
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
Classified as	CWE-416 (Use After Free)

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 use-after-free in l2cap_unregister_user

After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in

hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to

conn->users. However, l2cap_register_user() and l2cap_unregister_user()

don't use conn->lock, creating a race condition where these functions can

access conn->users and conn->hchan concurrently with l2cap_conn_del().

This can lead to use-after-free and list corruption bugs, as reported

by syzbot.

Fix this by changing l2cap_register_user() and l2cap_unregister_user()

to use conn->lock instead of hci_dev_lock(), ensuring consistent locking

for the l2cap_conn structure. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-23461
CVE	https://www.cve.org/CVERecord?id=CVE-2026-23461

Source

Reference

NVD

CVE