{"id":"CVE-2026-31657","revision":null,"records":[{"revision":"d938f1c4bda14302b505e5eb9ff740ad","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31657","aliases":[],"title":"batman-adv: hold claim backbone gateways by reference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: hold claim backbone gateways by reference\n\nbatadv_bla_add_claim() can replace claim->backbone_gw and drop the old\ngateway's last reference while readers still follow the pointer.\n\nThe netlink claim dump path dereferences claim->backbone_gw->orig and\ntakes claim->backbone_gw->crc_lock without pinning the underlying\nbackbone gateway. batadv_bla_check_claim() still has the same naked\npointer access pattern.\n\nReuse batadv_bla_claim_get_backbone_gw() in both readers so they operate\non a stable gateway reference until the read-side work is complete.\nThis keeps the dump and claim-check paths aligned with the lifetime\nrules introduced for the other BLA claim readers.","state":0,"publishedAt":"2026-04-24T14:45:08.867+00:00","modifiedAt":"2026-10-19T18:56:01.882+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/bridge_loop_avoidance.c\"\n ],\n \"versions\": [\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"5202f071b367ffbc8e279fc7a00db14f5e587f52\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"69d1ce9c72eca91203ffdb8d08bacd511100aec6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"f4858832ddef2f39f21e30b7226bbcd3c4b2bc96\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"2f55b58b5a0bbed192d60c444a45a49cdf1b545f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"7962b522222628596ca9ecc8722efc95367aadbd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"4dee4c0688443aaf5bbec74aa203c851d1d53c35\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"1f2dc36c297d27733f1b380ea644cf15a361bd7b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23721387c409087fd3b97e274f34d3ddc0970b74\",\n \"lessThan\": \"82d8701b2c930d0e96b0dbc9115a218d791cb0d2\",\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/bridge_loop_avoidance.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.5\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.5\",\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\": \"6.1.169\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.135\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.82\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.23\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.13\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\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/5202f071b367ffbc8e279fc7a00db14f5e587f52","https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6","https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96","https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f","https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd","https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35","https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b","https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31657","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31657","identifiers":["CVE-2026-31657"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; 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