{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-93209", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-93209", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-24T15:10:32.762Z", "updatedAt": "2026-10-19T09:07:21.427Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Bluetooth: hci_core: use skb_get() instead of skb_clone() for req_skb", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: use skb_get() instead of skb_clone() for req_skb\n\nBT enable fails intermittently with -ETIMEDOUT (-110). The kernel log\nshows the HCI Read Local Version command was sent and the firmware\nreplied with status 0x00 (logged by hci_req_cmd_complete() BT_DBG),\nbut the waiter in __hci_cmd_sync_sk() never woke up and timed out\nafter 10 s:\n\n bluetooth hci0: Opcode 0xfc00 // __hci_cmd_sync_sk\n bluetooth hci0: opcode 0xfc00 plen 1 // hci_cmd_sync_add\n bluetooth hci0: skb len 4 // hci_cmd_sync_alloc\n bluetooth hci0: length 1 // hci_req_sync_run\n Bluetooth: hci0 cmd_cnt 1 cmd queued 1 // hci_cmd_work\n Bluetooth: hci0 type 1 len 4 // hci_send_frame\n Bluetooth: opcode 0xfc00 status 0x00 // hci_req_cmd_complete\n <-- req_skb NULL: req_complete_skb not set,\n hci_cmd_sync_complete() never called,\n req_status stays HCI_REQ_PEND -->\n <-- 10 s later: wait_event_interruptible_timeout expires -->\n bluetooth hci0: end: err -110 // __hci_cmd_sync_sk\n\nThe root cause is that hci_send_cmd_sync() clones the sent command\ninto hdev->req_skb so that hci_req_cmd_complete() can locate the\nregistered completion callback. Under memory pressure this\nskb_clone() fails, leaving hdev->req_skb NULL. The firmware reply\nis received and processed, but hci_req_cmd_complete() finds NULL\nreq_skb, so hci_cmd_sync_complete() is never called, req_status\nstays HCI_REQ_PEND, and the waiter times out with -ETIMEDOUT.\n\nreq_skb is only used to read bt_cb(skb)->hci callbacks and opcode --\nit is never modified. Replace skb_clone() with skb_get(), which\nsimply increments the reference count of hdev->sent_cmd without\nallocating new memory and therefore cannot fail.\n\nThis issue was first observed as a use-after-free in ttyport_close()\nwhen ttyport_open() failed, which was investigated in an earlier\npatch series [1]. That investigation led to the discovery of the\ntrue root cause described above.\n\n[1] https://lore.kernel.org/all/20250430111617.1151390-1-quic_cxin@quicinc.com/", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "da77c1d39bc527b31890bfa0405763c82828defb", "status": "affected", "versionType": "git", "lessThan": "0337fb092873a4146aa854acb554675b49c8f6b5" }, { "version": "2af7aa6685e22d0dc546b0d27e5f16d3afe211fa", "status": "affected", "versionType": "git", "lessThan": "d5eef0747071934a1c080ee617fa4fd3566394c5" }, { "version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a", "status": "affected", "versionType": "git", "lessThan": "d7723320db4c9cb9ec2b9a36140e6c641dd77814" }, { "version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a", "status": "affected", "versionType": "git", "lessThan": "d0b28e9655f4b3195210627577f81883dc1d0162" }, { "version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a", "status": "affected", "versionType": "git", "lessThan": "26f66d5b8a5663af498f7ccc94fc79fb47a2191f" }, { "version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a", "status": "affected", "versionType": "git", "lessThan": "f5afdff569a09d1cb8cf19826199d024725576cb" }, { "version": "4ff121be63b761950610f422437aaaef8e075c40", "status": "affected", "versionType": "git" }, { "version": "18a4c59af609994552c8b39c5438304e070e55c7", "status": "affected", "versionType": "git" }, { "version": "6.1.83", "status": "affected", "versionType": "semver", "lessThan": "6.1.118" }, { "version": "6.6.23", "status": "affected", "versionType": "semver", "lessThan": "6.6.157" }, { "version": "6.7.11", "status": "affected", "versionType": "semver", "lessThan": "6.8" }, { "version": "6.8.2", "status": "affected", "versionType": "semver", "lessThan": "6.9" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.9" }, { "version": "6.1.118", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.109", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.50", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }