CVE-2026-89997 dm: fix resume-vs-remove race
A race condition in the Linux kernel device mapper allows a use-after-free, potentially enabling local attackers to execute code or escalate privileges.
- 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-2026-89997?
CVE-2026-89997 is a high-severity use after free vulnerability in Linux, published on 16 Sep 2026. 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:
dm: fix resume-vs-remove race
If the user issues the resume ioctl and the remove ioctl at the same time, it may be possible that the device is resumed after it is suspended in __dm_destroy. The result is that the table is destroyed without calling the postsuspend method.
Dm targets expect that they may be removed only after the postsuspend method method was called. If we break this expectation, it can cause misbehavior in various targets. For example - in the dm-integrity target, the reboot notifier is not unregistered, leading to use-after-free.
Fix this bug by refusing to resume if the device is being destroyed.
Which versions are affected by CVE-2026-89997?
How do I fix CVE-2026-89997?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-89997 being exploited?
There is no known exploitation of CVE-2026-89997 in the wild and no public exploit code.
Sources
Also known as AZL-101178, BELL-CVE-2026-89997, DEBIAN-CVE-2026-89997, GHSA-qw6j-46hc-qq7g, UBUNTU-CVE-2026-89997.