{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-64406", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2026-64406" ], "published": "2026-07-25T08:51:45Z", "summary": "Bluetooth: fix UAF in bt_accept_dequeue()", "details": "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.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.12.93-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.12.93+rpt-rpi-2712", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v6", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v7", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v7l", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v8", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v8-rt", "binary_version": "1:6.12.93-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.12.93-1+rpt1": { "linux_commit": "d8ab4e908235da7727f22dd36ad5af224671677d", "upstream_version": "6.12.93", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.96" } } } }, { "package": { "ecosystem": "Raspberry Pi OS:13", "name": "linux" }, "versions": [ "1:6.18.34-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.18.34+rpt-rpi-2712", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v6", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v7", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v8", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v8-rt", "binary_version": "1:6.18.34-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.18.34-1+rpt1": { "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af", "upstream_version": "6.18.34", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.18.39" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2026-64406" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c0577c55219be42b6ea2ea8db11e85bfab6f4e8d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-17T05:24:08Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 8.0, "cvss_v3_severity": "High", "scenario": "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." } } }