{"id":"CVE-2026-52914","summary":"batman-adv: fix fragment reassembly length accounting","details":"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 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.","modified":"2026-06-25T04:05:21.233922659Z","published":"2026-06-24T07:14:11.906Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52914.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255"},{"type":"WEB","url":"https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52914.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52914"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"610bfc6bc99bc83680d190ebc69359a05fc7f605"},{"fixed":"e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64"},{"fixed":"37be61825b15534a16ff9cfc9546de155b6df982"},{"fixed":"975563c5de1123dde1ec7946bf5556d20c89d74e"},{"fixed":"f653b040dad1af70fa5cd4fe085e4758925480c9"},{"fixed":"e910dbf509125fe51ad68e4fa74dc8ab0a8e787a"},{"fixed":"3eb8bcb823391bd58997831b3c9c152a4ba8e255"},{"fixed":"fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0"},{"fixed":"9cd3f16c320bfdadd4509358122368deb56a5741"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-52914.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.13.0"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-52914.json"}}],"schema_version":"1.7.5"}