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CVE-2026-80875: ipvs: use parsed transport offset in TCP state lookup

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-04

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.

Affected products

• Linux kernel: 2.6.28 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

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

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