{"id":"CVE-2026-89951","revision":null,"records":[{"revision":"76508154b857474ba00920ec4934d47a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89951","aliases":[],"title":"batman-adv: fix stale receive device on merged fragments","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix stale receive device on merged fragments\n\nFragment reassembly reuses the skb from the highest-numbered buffered\nfragment as the merged packet. When that fragment was received on a hard\ninterface which is deleted before the chain completes, the merged skb can\nre-enter the receive path with a stale skb->dev and skb_iif.\n\nbatadv_batman_skb_recv() passes such merged packets through the normal\nreceive handlers again. DAT and bridge loop avoidance both derive the ARP\nheader length from skb->dev, so they can dereference the freed net_device\nbefore the packet reaches the local mesh interface.\n\nRefresh the receive device metadata from the current receive device before\nrunning the packet handlers. This keeps internally reinjected merged\nfragments consistent with the normal receive path after hard interface\nteardown.","state":0,"publishedAt":"2026-09-16T10:32:36.179+00:00","modifiedAt":"2026-10-19T08:55:25.323+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/main.c\"\n ],\n \"versions\": [\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"63d86250fa7cbe22451369bd1c0881dfc8190958\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"f830c2dfc1431764db9256b3d5db1695fc9a7f56\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"f4b4ae763b5d59319fad62a00c76676758e7dafa\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"6df64825f8b199921120c685af2abca14b077331\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"a2c272da99c2077088083c14961cf2f1e4506995\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"e91d2cc7441d89a45bad73ad9789159c7441cb80\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"2dffc8c44b6e3347b3719c6419c07b4a18fea895\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"610bfc6bc99bc83680d190ebc69359a05fc7f605\",\n \"lessThan\": \"ad46c907d7d9975a285c1e89a4adde652eaa93f5\",\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/main.c\"\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\": \"5.10.270\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.51\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.5\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/63d86250fa7cbe22451369bd1c0881dfc8190958","https://git.kernel.org/stable/c/f830c2dfc1431764db9256b3d5db1695fc9a7f56","https://git.kernel.org/stable/c/f4b4ae763b5d59319fad62a00c76676758e7dafa","https://git.kernel.org/stable/c/6df64825f8b199921120c685af2abca14b077331","https://git.kernel.org/stable/c/a2c272da99c2077088083c14961cf2f1e4506995","https://git.kernel.org/stable/c/e91d2cc7441d89a45bad73ad9789159c7441cb80","https://git.kernel.org/stable/c/2dffc8c44b6e3347b3719c6419c07b4a18fea895","https://git.kernel.org/stable/c/ad46c907d7d9975a285c1e89a4adde652eaa93f5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89951","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89951","identifiers":["CVE-2026-89951"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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