{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26801","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.179Z","datePublished":"2024-04-04T08:20:29.211Z","dateUpdated":"2026-08-05T11:27:22.708Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:27:22.708Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Avoid potential use-after-free in hci_error_reset\n\nWhile handling the HCI_EV_HARDWARE_ERROR event, if the underlying\nBT controller is not responding, the GPIO reset mechanism would\nfree the hci_dev and lead to a use-after-free in hci_error_reset.\n\nHere's the call trace observed on a ChromeOS device with Intel AX201:\n   queue_work_on+0x3e/0x6c\n   __hci_cmd_sync_sk+0x2ee/0x4c0 [bluetooth <HASH:3b4a6>]\n   ? init_wait_entry+0x31/0x31\n   __hci_cmd_sync+0x16/0x20 [bluetooth <HASH:3b4a 6>]\n   hci_error_reset+0x4f/0xa4 [bluetooth <HASH:3b4a 6>]\n   process_one_work+0x1d8/0x33f\n   worker_thread+0x21b/0x373\n   kthread+0x13a/0x152\n   ? pr_cont_work+0x54/0x54\n   ? kthread_blkcg+0x31/0x31\n    ret_from_fork+0x1f/0x30\n\nThis patch holds the reference count on the hci_dev while processing\na HCI_EV_HARDWARE_ERROR event to avoid potential crash."}],"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 `HCI_EV_HARDWARE_ERROR` event that queues `hci_error_reset` is emitted by the Bluetooth controller, and an attacker within Bluetooth radio range can induce a controller firmware exception (the well-documented BrakTooth-class malformed-LMP faults) to generate it while simultaneously leaving the controller unresponsive, which is the exact precondition for the reset/unregister race. This is radio-proximity access, not routable network access.\nAC:L - Once the controller is wedged, the sequence is effectively deterministic: `btintel_hw_error()` blocks for two full `HCI_INIT_TIMEOUT` intervals while `hci_cmd_timeout()` counts to five and fires the GPIO reset, so the race window in which `hci_error_reset` runs against `hci_unregister_dev`/`hci_release_dev` is seconds wide and both sides are driven by the same attacker-induced controller failure. The bug was reproducible enough to be observed in the field on shipping ChromeOS/Intel AX201 hardware.\nPR:N - An over-the-air attacker needs no pairing, bonding, authentication, or any account on the target — malformed link-layer traffic that faults the controller firmware is processed before any credential check. No host-side privileges are involved at all since the triggering event arrives from the controller.\nUI:N - No victim action is required; the hardware error event, the command timeouts, the GPIO reset and the resulting USB disconnect/unregister all occur automatically inside the kernel once the controller faults.\nS:U - The use-after-free corrupts kernel heap memory within the same security authority as the vulnerable code; no VM, hypervisor, or IOMMU boundary is crossed.\nC:H - `hci_release_dev()` frees `hdev->workqueue` (and ultimately `kfree(hdev)`) while `hci_error_reset` is still executing, so `queue_work_on()` reads `wq->flags` and `wq->cpu_pwq` out of a freed slab object the attacker can groom by reclaiming it, yielding a kernel-memory read primitive and disclosure of adjacent heap contents and pointers.\nI:H - After the freed `workqueue_struct` is reclaimed with attacker-controlled data, `queue_work_on()` performs a list insertion into the pool worklist derived from that freed memory, giving a controlled write primitive suitable for corrupting adjacent kernel objects and hijacking control flow; the stale `hdev` is likewise written through by the continuing close/open sequence.\nA:H - The confirmed use-after-free reliably oopses or panics the kernel (the reported crash in `queue_work_on` from `hci_error_reset`), and the freed/destroyed workqueue also strands the subsequent `destroy_workqueue(hdev->req_workqueue)` drain, permanently wedging the Bluetooth stack."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c"],"versions":[{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"e0b278650f07acf2e0932149183458468a731c03","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"98fb98fd37e42fd4ce13ff657ea64503e24b6090","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"6dd0a9dfa99f8990a08eb8fdd8e79bee31c7d8e2","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"da4569d450b193e39e87119fd316c0291b585d14","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"45085686b9559bfbe3a4f41d3d695a520668f5e1","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"2ab9a19d896f5a0dd386e1f001c5309bc35f433b","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"dd594cdc24f2e48dab441732e6dfcafd6b0711d1","status":"affected","versionType":"git"},{"version":"c7741d16a57cbf97eebe53f27e8216b1ff20e20c","lessThan":"2449007d3f73b2842c9734f45f0aadb522daf592","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c"],"versions":[{"version":"4.0","status":"affected"},{"version":"0","lessThan":"4.0","status":"unaffected","versionType":"semver"},{"version":"4.19.309","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.271","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.212","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.151","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.81","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.21","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.9","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"4.19.309"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"5.4.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"5.10.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"5.15.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.1.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.6.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.7.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e0b278650f07acf2e0932149183458468a731c03"},{"url":"https://git.kernel.org/stable/c/98fb98fd37e42fd4ce13ff657ea64503e24b6090"},{"url":"https://git.kernel.org/stable/c/6dd0a9dfa99f8990a08eb8fdd8e79bee31c7d8e2"},{"url":"https://git.kernel.org/stable/c/da4569d450b193e39e87119fd316c0291b585d14"},{"url":"https://git.kernel.org/stable/c/45085686b9559bfbe3a4f41d3d695a520668f5e1"},{"url":"https://git.kernel.org/stable/c/2ab9a19d896f5a0dd386e1f001c5309bc35f433b"},{"url":"https://git.kernel.org/stable/c/dd594cdc24f2e48dab441732e6dfcafd6b0711d1"},{"url":"https://git.kernel.org/stable/c/2449007d3f73b2842c9734f45f0aadb522daf592"}],"title":"Bluetooth: Avoid potential use-after-free in hci_error_reset","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T00:14:13.522Z"},"title":"CVE Program 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