{"id":"CVE-2026-72253","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72253","summary":"netfilter: nf_conntrack_sip: validate skb_dst() before accessing it","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: validate skb_dst() before accessing it\n\ntc ingress and openvswitch do not guarantee routing information to be\navailable. These subsystems use the conntrack helper infrastructure, and\nthe SIP helper relies on the skb_dst() to be present if\nsip_external_media is set to 1 (which is disabled by default as a module\nparameter).\n\nThis effectively disables the sip_external_media toggle for these\nsubsystems without resulting in a crash.","published":"2026-08-15T05:54:41.490Z","modified":"2026-08-18T03:56:22.830142089Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.148"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/09755dc62b026076b1d47f83489eb0547c8135e0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b843a96252f672332837ea2ecb7c8db0acf68e20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c199ed687c00841daf60e9d131976958583a8c09"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e5e24a365a5e024efef63cc49abb345fbd4852c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e64a48c50a1ff565a98c6a98d82b5b942868e76e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72253.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72253"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:22.830142089Z"}}