{"id":"CVE-2026-74302","title":"Bluetooth: hci_core: Fix UAF in hci_unregister_dev()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Fix UAF in hci_unregister_dev()\n\nhci_unregister_dev() does not disable cmd_timer and ncmd_timer\nbefore the hci_dev structure is freed. If a timeout…","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 >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 48c7ad6afcc58c2cda11fed39791708103b6a644","Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < a0fd1086a57b982f8c24ae4ab165c2af39fe1735","Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 672d52d9412252e61b8de8d773ccdf5a277cf540","Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 5edcc018fa6e80b2c478454a4a8229c23d67c181","Linux 48542881997e17b49dc16b93fe910e0cfcf7a9f9","Linux 9cfc84b1d464cc024286f42a090718f9067b80ed","Linux ddeda6ca5f218b668b560d90fc31ae469adbfd92","Linux d2ce562a5aff1dcd0c50d9808ea825ef90da909f","Linux 96600c2e5ee8213dbab5df1617293d8e847bb4fa","Linux d6cbce18370641a21dd889e8613d8153df15eb39","Linux 3f939bd73fed12dddc2a32a76116c19ca47c7678","Linux >= 4.19.319 < 4.20","Linux >= 5.4.281 < 5.5","Linux >= 5.10.223 < 5.11","Linux >= 5.15.164 < 5.16","Linux >= 6.1.101 < 6.2","Linux >= 6.6.42 < 6.7","Linux >= 6.9.11 < 6.10","Linux 6.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:52:48.387407Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:31.734Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74302","references":[{"url":"https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644"},{"url":"https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735"},{"url":"https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540"},{"url":"https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181"}],"tags":["cve.org"],"epss":0.0017,"epssPercentile":0.0595,"ingestedAt":"2026-10-16T19:46:24.382Z","slug":"CVE-2026-74302","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Fix UAF in hci_unregister_dev()\n\nhci_unregister_dev() does not disable cmd_timer and ncmd_timer\nbefore the hci_dev structure is freed. If a timeout fires\nduring device teardown, the callback dereferences freed memory\n(including the hdev->reset function pointer), leading to a\nuse-after-free.\n\nAdd disable_delayed_work_sync() calls alongside the existing\ndisable_work_sync() calls to ensure both timers are fully\nquiesced before teardown proceeds.\n\n## Affected\n\n- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 48c7ad6afcc58c2cda11fed39791708103b6a644`\n- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < a0fd1086a57b982f8c24ae4ab165c2af39fe1735`\n- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 672d52d9412252e61b8de8d773ccdf5a277cf540`\n- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 5edcc018fa6e80b2c478454a4a8229c23d67c181`\n- `Linux 48542881997e17b49dc16b93fe910e0cfcf7a9f9`\n- `Linux 9cfc84b1d464cc024286f42a090718f9067b80ed`\n- `Linux ddeda6ca5f218b668b560d90fc31ae469adbfd92`\n- `Linux d2ce562a5aff1dcd0c50d9808ea825ef90da909f`\n- `Linux 96600c2e5ee8213dbab5df1617293d8e847bb4fa`\n- `Linux d6cbce18370641a21dd889e8613d8153df15eb39`\n- `Linux 3f939bd73fed12dddc2a32a76116c19ca47c7678`\n- `Linux >= 4.19.319 < 4.20`\n- `Linux >= 5.4.281 < 5.5`\n- `Linux >= 5.10.223 < 5.11`\n- `Linux >= 5.15.164 < 5.16`\n- `Linux >= 6.1.101 < 6.2`\n- `Linux >= 6.6.42 < 6.7`\n- `Linux >= 6.9.11 < 6.10`\n- `Linux 6.10`\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":[]}