CVE-2026-89799 bpf: Disable preemption in bpf_get_stackid
A race condition in the Linux kernel's bpf_get_stackid function can lead to system instability or crashes due to improper preemption handling.
- 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-2026-89799?
CVE-2026-89799 is a high-severity 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:
bpf: Disable preemption in bpf_get_stackid
The get_perf_callchain call needs disabled preemption plus we need it disabled as long as we access its returned trace entries buffer.
Note the bpf_get_stackid_pe function is executed already with preemption disabled.
Which versions are affected by CVE-2026-89799?
How do I fix CVE-2026-89799?
Apply the vendor's patch.
Is CVE-2026-89799 being exploited?
There is no known exploitation of CVE-2026-89799 in the wild and no public exploit code.
Sources
Also known as AZL-101343, BELL-CVE-2026-89799, DEBIAN-CVE-2026-89799, GHSA-p7rj-gh7c-64vc, UBUNTU-CVE-2026-89799.