CVE-2026-93222 signal: avoid shared siginfo namespace rewrites
A race condition in Linux kernel signal handling allows local attackers to corrupt shared siginfo data, potentially leading to privilege escalation or code execution.
- 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-2026-93222?
CVE-2026-93222 is a 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:
signal: avoid shared siginfo namespace rewrites
send_signal_locked() rewrites sender ids for the target namespace. Group sends reuse the same siginfo, so one recipient can affect the next.
Copy the siginfo before changing it.
Which versions are affected by CVE-2026-93222?
How do I fix CVE-2026-93222?
Apply the vendor's patch.
Is CVE-2026-93222 being exploited?
There is no known exploitation of CVE-2026-93222 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93222, DEBIAN-CVE-2026-93222, GHSA-fw3g-8x7h-cvj8, UBUNTU-CVE-2026-93222.