CVE-2026-31496 netfilter: nf_conntrack_expect: skip expectations in other netns via proc
An attacker can read connection tracking expectations from other network namespaces via proc, leading to information disclosure.
- 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-2026-31496?
CVE-2026-31496 is a medium-severity vulnerability in Linux kernel, published on 22 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:
netfilter: nf_conntrack_expect: skip expectations in other netns via proc
Skip expectations that do not reside in this netns.
Similar to e77e6ff502ea ("netfilter: conntrack: do not dump other netns's conntrack entries via proc").
Which versions are affected by CVE-2026-31496?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31496?
Apply the vendor's patch.
Is CVE-2026-31496 being exploited?
There is no known exploitation of CVE-2026-31496 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83198, BELL-CVE-2026-31496, DEBIAN-CVE-2026-31496, GHSA-7qwq-2hrf-8f6g, ROOT-OS-DEBIAN-11-CVE-2026-31496, ROOT-OS-DEBIAN-12-CVE-2026-31496 and 4 more.