CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
A use-after-free and double-free vulnerability in the Linux kernel's dibs driver allows attackers to potentially execute code or cause a system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74629?
CVE-2026-74629 is a high-severity use after free vulnerability in Linux, published on 22 Aug 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:
net/dibs: Correct freeing of dmb_clientid_arr
A dibs device interrupt handler can be active after dibs_dev_del() and may still access dmb_clientid_arr. (UAF)
In case of a failure in dibs_dev_add() being called by dibs_lo_dev_probe() dmb_clientid_arr is freed twice (double free).
Free dmb_clientid_arr in dibs_dev_release() after last reference is gone. Note that allocating in dibs_dev_add() instead of dibs_dev_alloc() is ok for now, because no dmbs can be registered before dibs_dev_add().
Which versions are affected by CVE-2026-74629?
How do I fix CVE-2026-74629?
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-2026-74629 being exploited?
There is no known exploitation of CVE-2026-74629 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74629, DEBIAN-CVE-2026-74629, GHSA-8jrf-fhpg-2ggp, UBUNTU-CVE-2026-74629.