{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64406","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.786Z","datePublished":"2026-07-25T08:50:47.978Z","dateUpdated":"2026-08-17T04:55:04.583Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:55:04.583Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix UAF in bt_accept_dequeue()\n\nbt_accept_get() takes a temporary reference before dropping the accept\nqueue lock. bt_accept_dequeue() currently drops that reference before\nbt_accept_unlink(), leaving only the queue reference.\n\nbt_accept_unlink() drops the queue reference. The subsequent\nsock_hold() therefore accesses freed memory if it was the final\nreference, as observed by KASAN during listening L2CAP socket cleanup.\n\nRetain the temporary queue-walk reference through unlink and hand it to\nthe caller on success. Drop it explicitly on the closed and\nnot-yet-connected paths."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable child is created through an incoming Bluetooth link, with its teardown driven by connection and disconnection events from a nearby peer. Bluetooth radio reachability is adjacent rather than routable network access.\nAC:L - The attacker can control listener cleanup and use an adjacent peer to connect and disconnect before the fixed channel becomes ready, producing the final queue-only reference state. The trigger is repeatable and Bluetooth BR/EDR support is a common default configuration.\nPR:L - Unprivileged SOCK_STREAM or SOCK_SEQPACKET L2CAP sockets and dynamic or fixed-CID binds require no capability; only raw sockets and reserved PSM binds are privileged. Although AF_BLUETOOTH requires init_net, an ordinary host user or user namespace without a new network namespace can reach it.\nUI:N - The attacker can close their own listener while controlling the peer connection lifecycle, requiring no action from another user.\nS:U - Exploitation compromises the vulnerable host kernel but does not inherently cross a VM, IOMMU, or other security-authority boundary.\nC:H - The freed struct sock comes from the general kmalloc-2k cache and can be reclaimed with attacker-controlled data. Subsequent socket and channel dereferences can be developed into arbitrary kernel-memory disclosure.\nI:H - The UAF causes an atomic write to freed memory followed by further operations on the freed socket and channel, enabling heap-spray-based corruption and potential control-flow hijacking.\nA:H - The confirmed post-free write can cause a kernel oops or panic, and the attacker can repeat the connection, disconnection, and cleanup sequence."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/af_bluetooth.c","net/bluetooth/l2cap_sock.c"],"versions":[{"version":"751de6ec671fe75ad9cf65a0638d2a06b6a5984d","lessThan":"c0577c55219be42b6ea2ea8db11e85bfab6f4e8d","status":"affected","versionType":"git"},{"version":"407217734835d21d4e0105ebf347860dc1806f88","lessThan":"96ad400d5132eb333f28f6f1e2d58f0728ca9547","status":"affected","versionType":"git"},{"version":"7eebd4c2c86f573af87ff165d08a83432eb0b919","lessThan":"0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0","status":"affected","versionType":"git"},{"version":"5d86d2f1b4d9a508c441d3e45277ae1a73cfed57","lessThan":"c66a95e60b65d876a927123b0ed36bd6177d9ca6","status":"affected","versionType":"git"},{"version":"87c543e2f78d0871f271df92dab98901bbd5b6f5","lessThan":"6303ed4bbe0095f4cc195225479bf506e010d1db","status":"affected","versionType":"git"},{"version":"added1213395071470a900cc845a042fb51882a6","lessThan":"26168db1ce5a9766cde021b18e590a101c056614","status":"affected","versionType":"git"},{"version":"ab1513597c6cf17cd1ad2a21e3b045421b48e022","lessThan":"50c662bdcd51b03033a0abed6716bfd377ba1049","status":"affected","versionType":"git"},{"version":"ab1513597c6cf17cd1ad2a21e3b045421b48e022","lessThan":"4bd0b274054f2679f28b70222b607bb0afc3ab9a","status":"affected","versionType":"git"},{"version":"a5ca86a6097a8b030ca3226cd300b17ed330f966","status":"affected","versionType":"git"},{"version":"5.10.259","lessThan":"5.10.261","status":"affected","versionType":"semver"},{"version":"5.15.210","lessThan":"5.15.212","status":"affected","versionType":"semver"},{"version":"6.1.175","lessThan":"6.1.178","status":"affected","versionType":"semver"},{"version":"6.6.142","lessThan":"6.6.145","status":"affected","versionType":"semver"},{"version":"6.12.92","lessThan":"6.12.96","status":"affected","versionType":"semver"},{"version":"6.18.34","lessThan":"6.18.39","status":"affected","versionType":"semver"},{"version":"7.0.11","lessThan":"7.1","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/af_bluetooth.c","net/bluetooth/l2cap_sock.c"],"versions":[{"version":"7.1","status":"affected"},{"version":"0","lessThan":"7.1","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.96","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.4","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"5.10.259","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.210","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.175","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.142","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.92","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.34","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c0577c55219be42b6ea2ea8db11e85bfab6f4e8d"},{"url":"https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547"},{"url":"https://git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0"},{"url":"https://git.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6"},{"url":"https://git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db"},{"url":"https://git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614"},{"url":"https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049"},{"url":"https://git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a"}],"title":"Bluetooth: fix UAF in bt_accept_dequeue()","x_generator":{"engine":"bippy-1.2.0"}}}}