CVE-2026-74535

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-74535

Key Details

CVE	CVE-2026-74535
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

Affected Products, Subsystems & Sectors

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

What to Know

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout

iso_sock_timeout() takes lock_sock, so sync disabling the timer while

holding that lock may deadlock.

iso_sock_timeout() may also run concurrently with iso_conn_del(), which

leads to UAF

[Task 1] [Task hdev->workqueue]

iso_sock_timeout iso_conn_del

iso_conn_hold_unless_zero iso_chan_del

`------------> iso_conn_put

caller frees hcon

iso_conn_put

iso_conn_free

conn->hcon->iso_data = NULL; /* UAF */

Fix the deadlock by removing the disable from the lock_sock sections.

Move the timer from iso_conn to iso_pinfo to decouple it from iso_conn

which may need to be freed in lock_sock section. Convert some of the

clear_timer to disable_timer. (NVD)

What to Do

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

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74535
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74535

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-74535

CVE

https://www.cve.org/CVERecord?id=CVE-2026-74535