{"id":"CVE-2026-72350","title":"netfilter: xt_u32: reject invalid shift counts","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_u32: reject invalid shift counts\n\nu32_match_it() executes rule-supplied shift operands on a 32-bit\nvalue. A malformed u32 rule can provide a shift count o…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < ca7c92d9701249e6daf132087756a88cbf2bb2a3","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < b33b44250d57ab0e5a1e2571b5285fb0d0a7f382","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 728f479dc0447ae7eaef87926ff49142e415a811","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 0a8b7a6d763775709c601f584e709ae48bcc000a","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < cce42014415cecd98aa49b3950e7b02ee7c81268","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < a597a722fb71a534138c20359b655726622b5f17","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 00d034fe8230dfc5832fe011ff2d81c1a2cc7a29","Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 64cdf7d30ac18e43df6c48004435febb965809a8","Linux 2.6.23"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:47:46.235964Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:19.841Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72350","references":[{"url":"https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3"},{"url":"https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382"},{"url":"https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811"},{"url":"https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a"},{"url":"https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268"},{"url":"https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17"},{"url":"https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29"},{"url":"https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8"}],"tags":["cve.org"],"epss":0.00176,"epssPercentile":0.06647,"ingestedAt":"2026-10-16T19:46:24.404Z","slug":"CVE-2026-72350","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_u32: reject invalid shift counts\n\nu32_match_it() executes rule-supplied shift operands on a 32-bit\nvalue. A malformed u32 rule can provide a shift count of 32 or more,\ntriggering an undefined shift out-of-bounds during packet evaluation.\n\nValidate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in\nu32_mt_checkentry() and reject malformed rules before they reach the\npacket path.\n\n## Affected\n\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < ca7c92d9701249e6daf132087756a88cbf2bb2a3`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < b33b44250d57ab0e5a1e2571b5285fb0d0a7f382`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 728f479dc0447ae7eaef87926ff49142e415a811`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 0a8b7a6d763775709c601f584e709ae48bcc000a`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < cce42014415cecd98aa49b3950e7b02ee7c81268`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < a597a722fb71a534138c20359b655726622b5f17`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 00d034fe8230dfc5832fe011ff2d81c1a2cc7a29`\n- `Linux >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de < 64cdf7d30ac18e43df6c48004435febb965809a8`\n- `Linux 2.6.23`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}