CVE-2026-64406 (GCVE-0-2026-64406)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-10-19 20:38
Severity ?
8.0 (High) - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.
References
Impacted products
Vendor Product Version
Linux Linux Version: 751de6ec671fe75ad9cf65a0638d2a06b6a5984d
Version: 407217734835d21d4e0105ebf347860dc1806f88
Version: 7eebd4c2c86f573af87ff165d08a83432eb0b919
Version: 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57
Version: 87c543e2f78d0871f271df92dab98901bbd5b6f5
Version: added1213395071470a900cc845a042fb51882a6
Version: ab1513597c6cf17cd1ad2a21e3b045421b48e022
Version: ab1513597c6cf17cd1ad2a21e3b045421b48e022
Version: a5ca86a6097a8b030ca3226cd300b17ed330f966
Version: 5.10.259   ≤
Version: 5.15.210   ≤
Version: 6.1.175   ≤
Version: 6.6.142   ≤
Version: 6.12.92   ≤
Version: 6.18.34   ≤
Version: 7.0.11   ≤
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          "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."
        }
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            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64406",
    "datePublished": "2026-07-25T08:50:47.978Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-10-19T20:38:27.281Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"751de6ec671fe75ad9cf65a0638d2a06b6a5984d\", \"lessThan\": \"c0577c55219be42b6ea2ea8db11e85bfab6f4e8d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"407217734835d21d4e0105ebf347860dc1806f88\", \"lessThan\": \"96ad400d5132eb333f28f6f1e2d58f0728ca9547\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049\"}, {\"url\": \"https://git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"5.10.259\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"5.15.210\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"6.1.175\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"6.6.142\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"6.12.92\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"6.18.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"7.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"7.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"7.0.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:55:04.583Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64406\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:27.281Z\", \"dateReserved\": \"2026-07-19T15:36:31.786Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:50:47.978Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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