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A vulnerability in the Linux kernel's netfilter subsystem (ip6t_eui64) allowed packets with invalid MAC headers to be processed improperly due to insufficient validation. Specifically, the function eui64_mt6() did not reject invalid MAC headers for packets where the fragment offset was zero, potentially leading to improper access of Ethernet header data. This flaw has been fixed by removing the condition that exempted packets with zero fragment offset from validation, ensuring all packets with invalid MAC headers are rejected before processing. The vulnerability affects multiple Linux kernel versions prior to certain patched releases. A patch is available and has been incorporated into updated kernel packages. Users should update and reboot to apply the fix.

The Linux kernel netfilter ip6t_eui64 module contained a vulnerability where the function eui64_mt6() derived a modified EUI-64 from the Ethernet source address and compared it with the IPv6 source address's low 64 bits. The existing validation only rejected invalid MAC headers when the packet's fragment offset (par->fragoff) was non-zero. For packets with a zero fragment offset, the function could access the Ethernet header even if it was invalid, leading to potential security issues. The fix removes the par->fragoff != 0 condition, ensuring all packets with invalid MAC headers are rejected before eth_hdr(skb) is accessed. This vulnerability is tracked as CVE-2026-31685 and has a CVSS 3.1 score of 9.4 (critical severity). Multiple Linux kernel versions prior to the patched releases are affected. Ubuntu security advisories USN-8490-1 and USN-8491-1 provide details and updated kernel package versions addressing this and other kernel vulnerabilities.

Detailed information about UBUNTU-CVE-2026-31685 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-31685 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets eui64_mt6()… (CVE-2026-31685)

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