CVE-2026-31682 bridge: br_nd_send: linearize skb before parsing ND options
A missing linearization check in the Linux kernel bridge module allows out-of-bounds memory access when parsing ND options, potentially causing crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31682?
CVE-2026-31682 is a critical memory corruption vulnerability in Linux kernel, published on 25 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bridge: br_nd_send: linearize skb before parsing ND options
br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request.
Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer.
Linearize request before option parsing and derive ns from the linear network header.
Weakness: CWE-125
Which versions are affected by CVE-2026-31682?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31682?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-31682 being exploited?
There is no known exploitation of CVE-2026-31682 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-84225, BELL-CVE-2026-31682, DEBIAN-CVE-2026-31682, GHSA-r8hp-cx2w-5c4r, ROOT-OS-DEBIAN-11-CVE-2026-31682, ROOT-OS-DEBIAN-12-CVE-2026-31682 and 3 more.