{"id":"CVE-2026-63945","title":"Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: serialize iso_sock_clear_timer with socket lock\n\niso_sock_close() calls iso_sock_clear_timer() before acquiring\nlock_sock(sk).\n\niso_sock_clear_timer() r…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 35f68f36d9883d56dec21cf85f7556d4657fc393","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 996c2104d0726a8fe584f85b3d6327197374a348","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < bc08c15746f25f41dd0508b25780d1e84acbb2ef","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 4b5f8e608749b7e8fa386c6e4301cf9272595859","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:34:00.838268Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:14.039Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63945","references":[{"url":"https://git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa"},{"url":"https://git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393"},{"url":"https://git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348"},{"url":"https://git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef"},{"url":"https://git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5"},{"url":"https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859"}],"tags":["cve.org"],"epss":0.00164,"epssPercentile":0.0524,"ingestedAt":"2026-10-16T17:24:46.783Z","slug":"CVE-2026-63945","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: serialize iso_sock_clear_timer with socket lock\n\niso_sock_close() calls iso_sock_clear_timer() before acquiring\nlock_sock(sk).\n\niso_sock_clear_timer() reads iso_pi(sk)->conn twice without the\nsocket lock held:\n\n    if (!iso_pi(sk)->conn)\n        return;\n    cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);\n\nConcurrently, iso_conn_del() executes under lock_sock(sk) and calls\niso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in\nthe final reference to the connection being dropped:\n\n    CPU0                         CPU1\n    ----                         ----\n    iso_sock_clear_timer()\n      if (conn != NULL) ...      lock_sock(sk)\n                                   iso_chan_del()\n                                   iso_pi(sk)->conn = NULL\n      cancel_delayed_work(conn)  /* NULL deref or UAF */\n\niso_pi(sk)->conn is not stable across the unlock window, causing a\nNULL pointer dereference or use-after-free.\n\nSerialize iso_sock_clear_timer() with the socket lock by moving it\ninside lock_sock()/release_sock(), matching the pattern used in\niso_conn_del() and all other call sites.\n\n## Affected\n\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 35f68f36d9883d56dec21cf85f7556d4657fc393`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 996c2104d0726a8fe584f85b3d6327197374a348`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < bc08c15746f25f41dd0508b25780d1e84acbb2ef`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 4b5f8e608749b7e8fa386c6e4301cf9272595859`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}