{"id":"CVE-2026-52914","revision":"7f8724fb557144c5ad45d2d4d24f96c6","records":[{"revision":"7f8724fb557144c5ad45d2d4d24f96c6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52914","aliases":[],"title":"batman-adv: fix fragment reassembly length accounting","description":"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.","state":0,"publishedAt":"2026-06-24T07:14:11.906+00:00","modifiedAt":"2026-10-19T19:36:59.956+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/batman-adv/fragmentation.c\",\n                        \"net/batman-adv/types.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"37be61825b15534a16ff9cfc9546de155b6df982\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"975563c5de1123dde1ec7946bf5556d20c89d74e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"f653b040dad1af70fa5cd4fe085e4758925480c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"e910dbf509125fe51ad68e4fa74dc8ab0a8e787a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"3eb8bcb823391bd58997831b3c9c152a4ba8e255\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n                            \"lessThan\": \"9cd3f16c320bfdadd4509358122368deb56a5741\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/batman-adv/fragmentation.c\",\n                        \"net/batman-adv/types.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.142\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.92\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.34\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.11\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64","https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982","https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e","https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9","https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a","https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255","https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0","https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52914","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52914","identifiers":["CVE-2026-52914"]},"retained":false,"historicalAffected":[]}],"coverage":[]}