CVE-2023-53292 blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none
A local attacker can cause a denial of service in the Linux kernel by triggering a NULL pointer dereference during block device elevator switching.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53292?
CVE-2023-53292 is a medium-severity vulnerability in Linux kernel, published on 16 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none
After grabbing q->sysfs_lock, q->elevator may become NULL because of elevator switch.
Fix the NULL dereference on q->elevator by checking it with lock.
Weakness: CWE-476
Which versions are affected by CVE-2023-53292?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53292?
Apply the vendor's patch.
Is CVE-2023-53292 being exploited?
There is no known exploitation of CVE-2023-53292 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-71203, BELL-CVE-2023-53292, DEBIAN-CVE-2023-53292, GHSA-j898-m92w-4243, ROOT-OS-DEBIAN-11-CVE-2023-53292, ROOT-OS-DEBIAN-12-CVE-2023-53292 and 2 more.