Bluetooth: hci_core: use skb_get() instead of skb_clone() for req_skb
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: use skb_get() instead of skb_clone() for req_skb BT enable fails intermittently with -ETIMEDOUT (-110). The kernel log shows the HCI Read Local Version command was sent and the firmware replied with status 0x00 (logged by hci_req_cmd_complete() BT_DBG), but the waiter in __hci_cmd_sync_sk() never woke up and timed out after 10 s: bluetooth hci0: Opcode 0xfc00 // __hci_cmd_sync_sk bluetooth hci0: opcode 0xfc00 plen 1 // hci_cmd_sync_add bluetooth hci0: skb len 4 // hci_cmd_sync_alloc bluetooth hci0: length 1 // hci_req_sync_run Bluetooth: hci0 cmd_cnt 1 cmd queued 1 // hci_cmd_work Bluetooth: hci0 type 1 len 4 // hci_send_frame Bluetooth: opcode 0xfc00 status 0x00 // hci_req_cmd_complete <-- req_skb NULL: req_complete_skb not set, hci_cmd_sync_complete() never called, req_status stays HCI_REQ_PEND --> <-- 10 s later: wait_event_interruptible_timeout expires --> bluetooth hci0: end: err -110 // __hci_cmd_sync_sk The root cause is that hci_send_cmd_sync() clones the sent command into hdev->req_skb so that hci_req_cmd_complete() can locate the registered completion callback. Under memory pressure this skb_clone() fails, leaving hdev->req_skb NULL. The firmware reply is received and processed, but hci_req_cmd_complete() finds NULL req_skb, so hci_cmd_sync_complete() is never called, req_status stays HCI_REQ_PEND, and the waiter times out with -ETIMEDOUT. req_skb is only used to read bt_cb(skb)
CVE-2026-93209
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93209
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "da77c1d39bc527b31890bfa0405763c82828defb",
"lessThan": "0337fb092873a4146aa854acb554675b49c8f6b5",
"versionType": "git"
},
{
"status": "affected",
"version": "2af7aa6685e22d0dc546b0d27e5f16d3afe211fa",
"lessThan": "d5eef0747071934a1c080ee617fa4fd3566394c5",
"versionType": "git"
},
{
"status": "affected",
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "d7723320db4c9cb9ec2b9a36140e6c641dd77814",
"versionType": "git"
},
{
"status": "affected",
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "d0b28e9655f4b3195210627577f81883dc1d0162",
"versionType": "git"
},
{
"status": "affected",
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "26f66d5b8a5663af498f7ccc94fc79fb47a2191f",
"versionType": "git"
},
{
"status": "affected",
"version": "2615fd9a7c2507eb3be3fbe49dcec88a2f56454a",
"lessThan": "f5afdff569a09d1cb8cf19826199d024725576cb",
"versionType": "git"
},
{
"status": "affected",
"version": "4ff121be63b761950610f422437aaaef8e075c40",
"versionType": "git"
},
{
"status": "affected",
"version": "18a4c59af609994552c8b39c5438304e070e55c7",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.83",
"lessThan": "6.1.118",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.23",
"lessThan": "6.6.157",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.7.11",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.8.2",
"lessThan": "6.9",
"versionType": "semver"
}
],
"programFiles": [
"net/bluetooth/hci_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.118",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/hci_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93209
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37912 · Revision 1
- Added to Heist Feed
- Publisher date