CVE-2026-18938 Integer overflow in Red Hat Enterprise Linux 10
A local attacker can cause a denial of service in p11-kit via an integer overflow leading to heap corruption on 32-bit systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-18938?
CVE-2026-18938 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 7 Aug 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 p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.
Weakness: CWE-122
Which versions are affected by CVE-2026-18938?
How do I fix CVE-2026-18938?
Apply the vendor's patch.
Is CVE-2026-18938 being exploited?
There is no known exploitation of CVE-2026-18938 in the wild and no public exploit code.
Sources
Also known as AZL-95481, DEBIAN-CVE-2026-18938, ECHO-09a0-891c-526d, GHSA-6x8p-h5fj-5ppr, OESA-2026-3503, ROOT-OS-DEBIAN-11-CVE-2026-18938 and 3 more.