{ "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 ]\n ? init_wait_entry+0x31/0x31\n __hci_cmd_sync+0x16/0x20 [bluetooth ]\n hci_error_reset+0x4f/0xa4 [bluetooth ]\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": 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