CVE-2026-31682
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
In the Linux kernel, a vulnerability was found in the bridge's br_nd_send() function, which parses neighbor discovery (ND) options from ICMPv6 packets. The function assumed these options are in the linear part of the buffer, but in some cases they can be non-linear, leading to out-of-bounds memory access. The fix linearizes the skb before parsing ND options.
Risk Assessment
An attacker can send a crafted ICMPv6 packet with non-linear ND options, causing out-of-bounds memory read. This may lead to sensitive data disclosure or system instability.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit that linearizes skb before ND option parsing). Monitor official security advisories from your Linux distribution.
Original NVD description (English source)
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.