{"id":"CVE-2026-52914","title":"batman-adv: fix fragment reassembly length accounting","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix fragment reassembly length accounting\n\nbatman-adv keeps a running payload length for queued fragments and uses it\nto validate a fragment chain before re…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 37be61825b15534a16ff9cfc9546de155b6df982","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 975563c5de1123dde1ec7946bf5556d20c89d74e","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < f653b040dad1af70fa5cd4fe085e4758925480c9","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < e910dbf509125fe51ad68e4fa74dc8ab0a8e787a","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 3eb8bcb823391bd58997831b3c9c152a4ba8e255","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0","Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 9cd3f16c320bfdadd4509358122368deb56a5741","Linux 3.13"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:22:33.098650Z"},"published":"2026-06-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:31:18.442Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52914","references":[{"url":"https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64"},{"url":"https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982"},{"url":"https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e"},{"url":"https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9"},{"url":"https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a"},{"url":"https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255"},{"url":"https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0"},{"url":"https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741"}],"tags":["cve.org"],"epss":0.00513,"epssPercentile":0.42405,"ingestedAt":"2026-10-16T17:24:46.718Z","slug":"CVE-2026-52914","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix fragment reassembly length accounting\n\nbatman-adv keeps a running payload length for queued fragments and uses it\nto validate a fragment chain before reassembly.\n\nThat accounting currently allows the accumulated fragment length to be\ntruncated during updates. As a result, malformed fragment chains can\nbypass the intended validation and drive reassembly with inconsistent\nlength state, leading to a local denial of service.\n\nFix the accounting by storing the accumulated length in a length-typed\nfield and rejecting update overflows before the existing validation logic\nruns.\n\nThe fix was verified against the original reproducer and against valid\nfragment reassembly paths.\n\n## Affected\n\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 37be61825b15534a16ff9cfc9546de155b6df982`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 975563c5de1123dde1ec7946bf5556d20c89d74e`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < f653b040dad1af70fa5cd4fe085e4758925480c9`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < e910dbf509125fe51ad68e4fa74dc8ab0a8e787a`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 3eb8bcb823391bd58997831b3c9c152a4ba8e255`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0`\n- `Linux >= 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 9cd3f16c320bfdadd4509358122368deb56a5741`\n- `Linux 3.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}