CVE-2026-93817 perf: Fix addr_filter_ranges lifetime
A use-after-free vulnerability in the Linux kernel's perf subsystem allows attackers to potentially 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-2026-93817?
CVE-2026-93817 is a high-severity use after free vulnerability in Linux, published on 24 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:
perf: Fix addr_filter_ranges lifetime
Lee Jia Jie reported that since event::addr_filter_ranges is used under RCU, it should be RCU freed.
Which versions are affected by CVE-2026-93817?
How do I fix CVE-2026-93817?
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-2026-93817 being exploited?
There is no known exploitation of CVE-2026-93817 in the wild and no public exploit code.
Sources
Also known as AZL-103892, BELL-CVE-2026-93817, DEBIAN-CVE-2026-93817, GHSA-r45r-rr2w-7hc6, UBUNTU-CVE-2026-93817.