{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46212", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.105Z", "datePublished": "2026-05-28T09:40:29.712Z", "dateUpdated": "2026-08-05T12:30:32.814Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:32.814Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: prevent use-after-free when deleting claims\n\nWhen batadv_bla_del_backbone_claims() removes all claims for a backbone, it\ndoes this by dropping the link entry in the hash list. This list entry\nitself was one of the references which need to be dropped at the same time\nvia batadv_claim_put().\n\nBut the batadv_claim_put() must not be done before the last access to the\nclaim object in this function. Otherwise the claim might be freed already\nby the batadv_claim_release() function before the list entry was dropped." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - batman-adv is a layer-2 mesh protocol where all nodes share one logical L2 broadcast domain; the malicious BLA ANNOUNCE claim frame must be injected by a node on the same shared LAN/mesh segment, not from an arbitrary remote network.\nAC:L - The attacker reliably triggers the path by sending an ANNOUNCE claim frame with a deliberately mismatched CRC, and the put-before-delete UAF executes deterministically when the hash holds the last reference (the normal case); no attacker-uncontrollable condition is required.\nPR:N - BLA frame processing happens automatically on received claim frames with no authentication and no privileges on the victim node; BLA is enabled by default.\nUI:N - The crafted claim frame is processed automatically by the receive/forward path with no victim interaction required.\nS:U - The use-after-free corrupts kernel heap memory within the kernel's own security authority; no crossing of a security boundary such as VM/IOMMU.\nC:H - Use-after-free of the claim object can give an attacker control over freed-object contents, enabling disclosure of kernel memory.\nI:H - Use-after-free is leverageable via heap spraying into arbitrary-write primitives and control-flow corruption of kernel structures.\nA:H - The use-after-free readily causes kernel oops/panic, crashing the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/bridge_loop_avoidance.c" ], "versions": [ { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "1d4b241482d9025c537afb3c7c8419c72c0e0c82", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "a1a99837bb6169cfb9187abaa2005e8f12079426", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "b88c865dcf6e9f20bfe66a360d4b62941ef769b8", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "368449e467d5f1e2c2e987bf2bd57000ba75e10b", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "6c5dc6d68e6ba7f0224a757a39ed52fcdb54d472", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "00155f336a5e8b1006d2ca9ae7ad8fc4a44bb401", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "0cc9847c64cb6e61118bc78c9187c8209a7197fa", "status": "affected", "versionType": "git" }, { "version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": "4ae1709a314060a196981b344610d023ea841e57", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/bridge_loop_avoidance.c" ], "versions": [ { "version": "3.5", "status": "affected" }, { "version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.9", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.90" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.18.32" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.0.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1d4b241482d9025c537afb3c7c8419c72c0e0c82" }, { "url": "https://git.kernel.org/stable/c/a1a99837bb6169cfb9187abaa2005e8f12079426" }, { "url": "https://git.kernel.org/stable/c/b88c865dcf6e9f20bfe66a360d4b62941ef769b8" }, { "url": "https://git.kernel.org/stable/c/368449e467d5f1e2c2e987bf2bd57000ba75e10b" }, { "url": "https://git.kernel.org/stable/c/6c5dc6d68e6ba7f0224a757a39ed52fcdb54d472" }, { "url": "https://git.kernel.org/stable/c/00155f336a5e8b1006d2ca9ae7ad8fc4a44bb401" }, { "url": "https://git.kernel.org/stable/c/0cc9847c64cb6e61118bc78c9187c8209a7197fa" }, { "url": "https://git.kernel.org/stable/c/4ae1709a314060a196981b344610d023ea841e57" } ], "title": "batman-adv: bla: prevent use-after-free when deleting claims", "x_generator": { "engine": "bippy-1.2.0" } } } }