CVE-2026-74370 liveupdate: fix TOCTOU race in luo_session_retrieve()
A time-of-check to time-of-use race condition in the Linux kernel liveupdate module allows local attackers to cause use-after-free, leading to privilege escalation or system crash.
- 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-2026-74370?
CVE-2026-74370 is a vulnerability in Linux, published on 15 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:
liveupdate: fix TOCTOU race in luo_session_retrieve()
Extend the scope of the rwsem_read lock in luo_session_retrieve() to overlap with the acquisition of the session mutex. This prevents a concurrent thread from releasing and freeing the session between the lookup and the mutex lock.
Which versions are affected by CVE-2026-74370?
How do I fix CVE-2026-74370?
Apply the vendor's patch.
Is CVE-2026-74370 being exploited?
There is no known exploitation of CVE-2026-74370 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-74370, GHSA-rjgv-c7p2-jj9p, UBUNTU-CVE-2026-74370.