VULN/vuln-cve
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vuln-cve/data/2026/93xxx/CVE-2026-93209.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-93209",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-17T16:02:15.093Z",
"datePublished": "2026-09-24T15:10:32.762Z",
"dateUpdated": "2026-10-19T09:07:21.427Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T09:07:21.427Z"
},
"descriptions": [
{
"lang": "en",
"value": "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": [
{
"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": "da77c1d39bc527b31890bfa0405763c82828defb",
"lessThan": "0337fb092873a4146aa854acb554675b49c8f6b5",
"status": "affected",
"versionType": "git"
},
{
"version": "2af7aa6685e22d0dc546b0d27e5f16d3afe211fa",
"lessThan": "d5eef0747071934a1c080ee617fa4fd3566394c5",
"status": "affected",
"versionType": "git"
},
{
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "d7723320db4c9cb9ec2b9a36140e6c641dd77814",
"status": "affected",
"versionType": "git"
},
{
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "d0b28e9655f4b3195210627577f81883dc1d0162",
"status": "affected",
"versionType": "git"
},
{
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "26f66d5b8a5663af498f7ccc94fc79fb47a2191f",
"status": "affected",
"versionType": "git"
},
{
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "f5afdff569a09d1cb8cf19826199d024725576cb",
"status": "affected",
"versionType": "git"
},
{
"version": "4ff121be63b761950610f422437aaaef8e075c40",
"status": "affected",
"versionType": "git"
},
{
"version": "18a4c59af609994552c8b39c5438304e070e55c7",
"status": "affected",
"versionType": "git"
},
{
"version": "6.1.83",
"lessThan": "6.1.118",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.6.23",
"lessThan": "6.6.157",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.7.11",
"lessThan": "6.8",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.8.2",
"lessThan": "6.9",
"status": "affected",
"versionType": "semver"
}
]
},
{
"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": "6.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.9",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.118",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"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": "6.1.83",
"versionEndExcluding": "6.1.118"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.23",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "6.12.109"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "6.18.50"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "7.2.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "7.3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.7.11"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.8.2"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/0337fb092873a4146aa854acb554675b49c8f6b5"
},
{
"url": "https://git.kernel.org/stable/c/d5eef0747071934a1c080ee617fa4fd3566394c5"
},
{
"url": "https://git.kernel.org/stable/c/d7723320db4c9cb9ec2b9a36140e6c641dd77814"
},
{
"url": "https://git.kernel.org/stable/c/d0b28e9655f4b3195210627577f81883dc1d0162"
},
{
"url": "https://git.kernel.org/stable/c/26f66d5b8a5663af498f7ccc94fc79fb47a2191f"
},
{
"url": "https://git.kernel.org/stable/c/f5afdff569a09d1cb8cf19826199d024725576cb"
}
],
"title": "Bluetooth: hci_core: use skb_get() instead of skb_clone() for req_skb",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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