CVE-2026-80875 PUBLISHED

ipvs: use parsed transport offset in TCP state lookup

Assigner: Linux
Reserved: 26.08.2026 Published: 04.09.2026 Updated: 04.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to 2d06e0897ce18228d199887f0823b431d841dd03 (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to 816efb7fc0aeae986e63ac73b428dd97a4ef69f5 (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to 5848e914b85e360a2dd9d19c00a72e2ea9617dd0 (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to d45f73c274435703e8d7bc9d8b742a5d9111ab6e (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to f6f550f26562d191c30b2818e7925dcb1c7f166c (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to d73f4249776dd970ad65a69cfc51613dd8a034bb (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to c2ee845e292c278fac75bf28d96bc892607fd5c4 (excl.)
  • affected from 0bbdd42b7efa66685b6d74701bcde3a596a3a59d to 2500fa3958b1ba51c2b065e39db1b04dfa7e23a2 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.28 is affected
  • unaffected from 0 to 2.6.28 (excl.)
  • unaffected from 5.10.261 to 5.10.* (incl.)
  • unaffected from 5.15.212 to 5.15.* (incl.)
  • unaffected from 6.1.178 to 6.1.* (incl.)
  • unaffected from 6.6.145 to 6.6.* (incl.)
  • unaffected from 6.12.97 to 6.12.* (incl.)
  • unaffected from 6.18.40 to 6.18.* (incl.)
  • unaffected from 7.1.5 to 7.1.* (incl.)
  • unaffected from 7.2 to * (incl.)

References