{"id":"CVE-2026-74537","title":"Bluetooth: ISO: hold sk properly in iso_conn_ready","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: hold sk properly in iso_conn_ready\n\nsk deref in iso_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. c…","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 >= 27c24fda62b601d6f9ca5e992502578c4310876f < 4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5","Linux >= 27c24fda62b601d6f9ca5e992502578c4310876f < 1308d72903d792d10b82bc4ef08b8a4452308b04","Linux >= 27c24fda62b601d6f9ca5e992502578c4310876f < 0d255e63fcf3f13a570d7ac11678fa1164ac015c","Linux 5.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:59:33.051138Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:54.154Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74537","references":[{"url":"https://git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5"},{"url":"https://git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04"},{"url":"https://git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c"}],"tags":["cve.org"],"epss":0.00239,"epssPercentile":0.13915,"ingestedAt":"2026-10-16T19:46:24.347Z","slug":"CVE-2026-74537","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: hold sk properly in iso_conn_ready\n\nsk deref in iso_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. conn->sk is currently\naccessed without either:\n\n    [Task 1]            [Task 2]\n                        iso_sock_release\n    iso_conn_ready\n      sk = conn->sk\n                          lock_sock(sk)\n                            conn->sk = NULL\n      lock_sock(sk)\n                          release_sock(sk)\n                          iso_sock_kill(sk)\n       UAF on sk deref\n\nFix possible UAF by holding sk refcount in iso_conn_ready().  Also\nrecheck after lock_sock that the socket is still valid.  Adjust locking\nso conn->sk is cleared only under lock_sock.\n\n## Affected\n\n- `Linux >= 27c24fda62b601d6f9ca5e992502578c4310876f < 4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5`\n- `Linux >= 27c24fda62b601d6f9ca5e992502578c4310876f < 1308d72903d792d10b82bc4ef08b8a4452308b04`\n- `Linux >= 27c24fda62b601d6f9ca5e992502578c4310876f < 0d255e63fcf3f13a570d7ac11678fa1164ac015c`\n- `Linux 5.15`\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,"exploitation":0,"ransomware":0},"changes":[]}