Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock(). This lets it race against hci_dev_do_close() -> btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock. When both paths manipulate hdev->req_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb(). Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer. Below is the data race report and the kasan report: BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined read of hdev->req_rsp at net/bluetooth/hci_sync.c:199 by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254 hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030 write/free by task ioctl/22580: btintel_shutdown_combined+0xd0/0x360 drivers/bluetooth/btintel.c:3648 hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246 hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526 BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202 Read of size 4 at addr fff
CVE-2026-31500
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-2026-31500
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": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "7e041d0aad1d4d43d921ace052e04f4e2cacaed3",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "5f84e845648dfa86e42de5487f1a774b42f0444d",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "e10a4cb72468686ffbe8bb2b0520e37f6be1a0c5",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "66696648af477dc87859e5e4b607112f5f29d010",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "f7d84737663ad4a120d2d8ef1561a4df91282c2e",
"versionType": "git"
},
{
"status": "affected",
"version": "973bb97e5aee56edddaae3d5c96877101ad509c0",
"lessThan": "94d8e6fe5d0818e9300e514e095a200bd5ff93ae",
"versionType": "git"
}
],
"programFiles": [
"drivers/bluetooth/btintel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/bluetooth/btintel.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31500
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28287 · Revision 1
- Added to Heist Feed
- Publisher date