CVE-2026-45930 net: mctp: ensure our nlmsg responses are initialised
A local attacker can read uninitialized kernel memory via netlink responses, potentially exposing sensitive data.
- 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-2026-45930?
CVE-2026-45930 is a medium-severity vulnerability in Linux kernel, published on 27 May 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:
net: mctp: ensure our nlmsg responses are initialised
Syed Faraz Abrar (@farazsth98) from Zellic, and Pumpkin (@u1f383) from DEVCORE Research Team working with Trend Micro Zero Day Initiative report that a RTM_GETNEIGH will return uninitalised data in the pad bytes of the ndmsg data.
Ensure we're initialising the netlink data to zero, in the link, addr and neigh response messages.
Which versions are affected by CVE-2026-45930?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45930?
Apply the vendor's patch.
Is CVE-2026-45930 being exploited?
There is no known exploitation of CVE-2026-45930 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88658, BELL-CVE-2026-45930, DEBIAN-CVE-2026-45930, GHSA-m7mh-8j45-fp89, ROOT-OS-DEBIAN-12-CVE-2026-45930, ROOT-OS-DEBIAN-13-CVE-2026-45930 and 3 more.