CVE-2026-31542 x86/platform/uv: Handle deconfigured sockets
A null pointer dereference in the Linux kernel UV platform code causes a system panic when handling deconfigured sockets.
- 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-2026-31542?
CVE-2026-31542 is a medium-severity vulnerability in Linux kernel, published on 24 Apr 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:
x86/platform/uv: Handle deconfigured sockets
When a socket is deconfigured, it's mapped to SOCK_EMPTY (0xffff). This causes a panic while allocating UV hub info structures.
Fix this by using NUMA_NO_NODE, allowing UV hub info structures to be allocated on valid nodes.
Which versions are affected by CVE-2026-31542?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31542?
Apply the vendor's patch.
Is CVE-2026-31542 being exploited?
There is no known exploitation of CVE-2026-31542 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31542, DEBIAN-CVE-2026-31542, GHSA-crf5-4j2q-5xrq, ROOT-OS-DEBIAN-13-CVE-2026-31542, ROOT-OS-UBUNTU-2404-CVE-2026-31542, UBUNTU-CVE-2026-31542.