{"id":"CVE-2026-63974","title":"Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close\n\nSince hci_dev_close_sync() can now be called during the reset path, we\nshould also set HCI_CMD_DRA…","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","cwe":["CWE-366"],"vendor":"Linux","product":"Linux","affected":["Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21","Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9","Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e","Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff","Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 525daaea459fc215f432de1b8debbd9144bf97b0","Linux 4bf367fa1fefabdf14938d0ac9ed60020389112e","Linux 3b382555706558f5c0587862b6dc03e96a252bba","Linux >= 5.18.18 < 5.19","Linux >= 5.19.2 < 5.20","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:34:21.021938Z"},"published":"2026-07-19","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:42:48.103Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63974","references":[{"url":"https://git.kernel.org/stable/c/7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21"},{"url":"https://git.kernel.org/stable/c/9cebe4680bb9a72f80c6541eb24af06db7a1fbc9"},{"url":"https://git.kernel.org/stable/c/47330cc875b36a1cf7b3543cb2cf90a7c603ce0e"},{"url":"https://git.kernel.org/stable/c/60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff"},{"url":"https://git.kernel.org/stable/c/525daaea459fc215f432de1b8debbd9144bf97b0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63974.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-63974"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2502462"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63974"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63974"},{"url":"https://lore.kernel.org/linux-cve-announce/2026071900-CVE-2026-63974-2863@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:83207"},{"url":"https://access.redhat.com/errata/RHSA-2026:86033"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00344,"epssPercentile":0.27733,"patched":["10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_hidden_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_real_time_v_9"],"scores":{"cna":8.8,"vendor":7.3},"ingestedAt":"2026-10-16T17:24:46.785Z","slug":"CVE-2026-63974","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close\n\nSince hci_dev_close_sync() can now be called during the reset path, we\nshould also set HCI_CMD_DRAIN_WORKQUEUE. This avoids queuing timeouts\nwhile the hdev workqueue is being drained.\n\n## Affected\n\n- `Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21`\n- `Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9`\n- `Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e`\n- `Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff`\n- `Linux >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 525daaea459fc215f432de1b8debbd9144bf97b0`\n- `Linux 4bf367fa1fefabdf14938d0ac9ed60020389112e`\n- `Linux 3b382555706558f5c0587862b6dc03e96a252bba`\n- `Linux >= 5.18.18 < 5.19`\n- `Linux >= 5.19.2 < 5.20`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:83207** · Red Hat · fixed in: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83207)\n- **RHSA-2026:86033** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86033)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63974.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":227198,"id":"CVE-2026-63974","ts":1792587048108,"field":"cvss","old":"7.3","new":"8.8"},{"seq":227170,"id":"CVE-2026-63974","ts":1792585181015,"field":"cvss","old":"8.8","new":"7.3"}]}