CVE-2026-91142 Cockpit: cockpit: unauthorized modification of login records via integer overflow
An authenticated local user with a large UID can exploit an integer overflow to read or overwrite other users' login records.
- 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-2026-91142?
CVE-2026-91142 is a low-severity vulnerability in Red Hat Enterprise Linux 10, published on 18 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in Cockpit. An authenticated local user with a large user identifier (UID) can cause unauthorized modification and disclosure of login records. On 32-bit systems, an integer overflow during session accounting allows the user's login process to read or overwrite the legacy log entries of other accounts.
Weakness: CWE-190
Which versions are affected by CVE-2026-91142?
How do I fix CVE-2026-91142?
Apply the vendor's patch.
Is CVE-2026-91142 being exploited?
There is no known exploitation of CVE-2026-91142 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91142, GHSA-2f43-vjp7-v3qj, UBUNTU-CVE-2026-91142.