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vuln-cve/data/2026/46xxx/CVE-2026-46212.json
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{
"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"
}
}
}
}
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