{ "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" } } } }