CVE-2026-80875

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    CVE-2026-80875

    Published: 4 Sept 2026Last Modified: 6 Sept 2026

    Summary: ipvs: use parsed transport offset in TCP state lookup

    Details: 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.

    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, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80875.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80875, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0bbdd42b7efa66685b6d74701bcde3a596a3a59d
    Fixed -2d06e0897ce18228d199887f0823b431d841dd03

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-80875 | CVE-DB