{"id":"CVE-2026-31408","title":"Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\n\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d57384e27d1ebf0047e3f00a6e1181b8be9857a2","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b0a7da0e3f7442545f071499beb36374714bb9de","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 108b81514d8f2535eb16651495cefb2250528db3","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e76e8f0581ef555eacc11dbb095e602fb30a5361","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 598dbba9919c5e36c54fe1709b557d64120cb94b","Linux 2.6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:09:03.338755Z"},"published":"2026-04-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:09:59.172Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31408","references":[{"url":"https://git.kernel.org/stable/c/37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d"},{"url":"https://git.kernel.org/stable/c/d57384e27d1ebf0047e3f00a6e1181b8be9857a2"},{"url":"https://git.kernel.org/stable/c/b0a7da0e3f7442545f071499beb36374714bb9de"},{"url":"https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1"},{"url":"https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3"},{"url":"https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e"},{"url":"https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361"},{"url":"https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b"}],"tags":["cve.org"],"epss":0.004,"epssPercentile":0.32744,"ingestedAt":"2026-10-16T17:24:46.650Z","slug":"CVE-2026-31408","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\n\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock without holding a reference to the socket. A concurrent\nclose() can free the socket between the lock release and the subsequent\nsk->sk_state access, resulting in a use-after-free.\n\nOther functions in the same file (sco_sock_timeout(), sco_conn_del())\ncorrectly use sco_sock_hold() to safely hold a reference under the lock.\n\nFix by using sco_sock_hold() to take a reference before releasing the\nlock, and adding sock_put() on all exit paths.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d57384e27d1ebf0047e3f00a6e1181b8be9857a2`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b0a7da0e3f7442545f071499beb36374714bb9de`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 108b81514d8f2535eb16651495cefb2250528db3`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e76e8f0581ef555eacc11dbb095e602fb30a5361`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 598dbba9919c5e36c54fe1709b557d64120cb94b`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}