{"id":"CVE-2026-68390","state":"PUBLISHED","title":"Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups\n\nhci_conn_params_lookup requires hdev->lock be held, otherwise the list\niteration or param access is not safe.\n\nHold hdev->lock for params lookups in hci_sync.","publishedAt":"2026-08-10T12:04:09.373Z","updatedAt":"2026-08-17T05:04:37.940Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c530569adc19b5f0c62955de41f067bad34e3fe0","status":"affected","lessThan":"8d892bec1dd134761cabec6ba23fe315d0f20f98","versionType":"git"},{"version":"c530569adc19b5f0c62955de41f067bad34e3fe0","status":"affected","lessThan":"c363202ec841df36421ec280eea3d5f94f556143","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]}],"references":["https://git.kernel.org/stable/c/8d892bec1dd134761cabec6ba23fe315d0f20f98","https://git.kernel.org/stable/c/c363202ec841df36421ec280eea3d5f94f556143"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68390.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68390","state":"PUBLISHED","datePublished":"2026-08-10T12:04:09.373Z","dateUpdated":"2026-08-17T05:04:37.940Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.388Z"},"containers":{"cna":{"title":"Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups\n\nhci_conn_params_lookup requires hdev->lock be held, otherwise the list\niteration or param access is not safe.\n\nHold hdev->lock for params lookups in hci_sync."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c530569adc19b5f0c62955de41f067bad34e3fe0","status":"affected","lessThan":"8d892bec1dd134761cabec6ba23fe315d0f20f98","versionType":"git"},{"version":"c530569adc19b5f0c62955de41f067bad34e3fe0","status":"affected","lessThan":"c363202ec841df36421ec280eea3d5f94f556143","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8d892bec1dd134761cabec6ba23fe315d0f20f98"},{"url":"https://git.kernel.org/stable/c/c363202ec841df36421ec280eea3d5f94f556143"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable hci_sync paths are Bluetooth LE host-stack code: hci_le_create_conn_sync is queued autonomously from check_pending_le_conn() on incoming LE advertising reports, and the racing hci_conn_params_del() side is driven by LE connection-complete/failure and disconnect events, so a device in radio range drives the bug over the air.\nAC:L - The attacker controls both sides of the race — repeated LE connect/disconnect and PA-sync setup/teardown cycles queue the cmd_sync work while the event workqueue concurrently runs hci_conn_params_del()/hci_conn_del() under hdev->lock — and the sleeping hci_pause_advertising_sync() right before the unlocked lookup widens the window, so it can be retried until won.\nPR:N - No credentials, pairing, or local account are needed: the host stack queues hci_le_create_conn_sync automatically in response to advertising reports from a device on the accept list, and the freeing side is triggered by connection-complete/failure events the peer controls.\nUI:N - Background LE scanning, auto-connect, accept-list programming, and connection-failure cleanup are performed autonomously by the kernel whenever connection state changes; no victim action such as pairing confirmation or opening a device is required.\nS:U - The corruption is confined to kernel heap objects owned by the Bluetooth subsystem within the same security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - hci_conn_params_lookup() iterates and dereferences a list entry that another CPU may have list_del()'d and kfree()'d, and hci_le_pa_create_sync() reads le->dst/le->handle from a possibly freed hci_conn; a groomed slab yields an arbitrary read primitive, and the stale values are copied into the outgoing HCI command, leaking kernel heap contents over the air.\nI:H - This is a classic slab use-after-free on hci_conn_params/hci_conn: reclaiming the freed object with attacker-controlled data gives write and control-flow primitives, and the corrupted values are written into conn->le_conn_* fields and the HCI command payload, so kernel memory corruption and privilege escalation are leverageable.\nA:H - Walking le_conn_params without hdev->lock while an entry is removed dereferences LIST_POISON1 or freed memory, producing slab-use-after-free KASAN splats, oopses, or a kernel panic in the Bluetooth workqueues."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:04:37.940Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}