CVE-2026-80875

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: use parsed transport offset in TCP state lookup TCP state handling reparses the skb to find the TCP header. For IPv6 it uses sizeof(struct ipv6hdr), while the surrounding IPVS code already parsed the packet with ip_vs_fill_iph_skb() and has the real transport-header offset in iph.len. This makes TCP state handling look at the wrong bytes when an IPv6 packet carries extension headers. Use the parsed transport offset passed down from ip_vs_set_state() when reading the TCP header. For IPv4 and for IPv6 packets without extension headers, the passed offset matches the previous value.

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EPSS — Exploit Prediction

0.0016

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/2500fa3958b1ba51c2b065e39db1b04dfa7e23a2 https://git.kernel.org/stable/c/2d06e0897ce18228d199887f0823b431d841dd03 https://git.kernel.org/stable/c/5848e914b85e360a2dd9d19c00a72e2ea9617dd0 https://git.kernel.org/stable/c/816efb7fc0aeae986e63ac73b428dd97a4ef69f5 https://git.kernel.org/stable/c/c2ee845e292c278fac75bf28d96bc892607fd5c4 https://git.kernel.org/stable/c/d45f73c274435703e8d7bc9d8b742a5d9111ab6e https://git.kernel.org/stable/c/d73f4249776dd970ad65a69cfc51613dd8a034bb https://git.kernel.org/stable/c/f6f550f26562d191c30b2818e7925dcb1c7f166c

Frequently Asked Questions

What is CVE-2026-80875? +

In the Linux kernel, the following vulnerability has been resolved: ipvs: use parsed transport offset in TCP state lookup TCP state handling reparses the skb to find the TCP header. For IPv6 it uses sizeof(struct ipv6hdr), while the surrounding IPVS code already parsed the packet with ip_vs_fill_iph_skb() and has the real transport-header offset in iph.len. This makes TCP state handling look at the wrong bytes when an IPv6 packet carries extension headers. Use the parsed transport offset passed down from ip_vs_set_state() when reading the TCP header. For IPv4 and for IPv6 packets without extension headers, the passed offset matches the previous value.

How do I check if I'm vulnerable to CVE-2026-80875? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.