UBUNTU-CVE-2026-100070

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    UBUNTU-CVE-2026-100070

    Published: 25 Sept 2026Last Modified: 6 Nov 2026
    Upstream:
    CVE-2026-100070

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such as when the public NAT IP string is shorter or longer than the internal IP, coff will still point to the offset relative to the pre-mangled packet. If the packet shrinks, coff could overshoot the correct position, potentially causing the next ct_sip_parse_header_uri() call to silently skip bytes and miss subsequent Contact headers. Could this lead to a failure to NAT those subsequent headers and leak internal network details?

    References: https://ubuntu.com/security/CVE-2026-100070, https://www.cve.org/CVERecord?id=CVE-2026-100070, https://git.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272ee, https://git.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690, https://git.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46, https://git.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2, https://git.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140, https://git.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465, https://git.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122, https://git.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3, https://ubuntu.com/security/notices/USN-8961-1, https://ubuntu.com/security/notices/USN-8959-1, https://ubuntu.com/security/notices/USN-8963-1

    Affected packages

    Package

    Name: linux

    Purl: pkg:deb/ubuntu/linux?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.11.0-12.19

    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
    UBUNTU-CVE-2026-100070 | CVE-DB