Bluetooth: hci_core: lookup hci_conn on RX path on protocol side
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: lookup hci_conn on RX path on protocol side The hdev lock/lookup/unlock/use pattern in the packet RX path doesn't ensure hci_conn* is not concurrently modified/deleted. This locking appears to be leftover from before conn_hash started using RCU commit bf4c63252490b ("Bluetooth: convert conn hash to RCU") and not clear if it had purpose since then. Currently, there are code paths that delete hci_conn* from elsewhere than the ordered hdev->workqueue where the RX work runs in. E.g. commit 5af1f84ed13a ("Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync") introduced some of these, and there probably were a few others before it. It's better to do the locking so that even if these run concurrently no UAF is possible. Move the lookup of hci_conn and associated socket-specific conn to protocol recv handlers, and do them within a single critical section to cover hci_conn* usage and lookup. syzkaller has reported a crash that appears to be this issue: [Task hdev->workqueue] [Task 2] hci_disconnect_all_sync l2cap_recv_acldata(hcon) hci_conn_get(hcon) hci_abort_conn_sync(hcon) hci_dev_lock hci_dev_lock hci_conn_del(hcon) v-------------------------------- hci_dev_unlock hci_conn_put(hcon) conn = hcon->l2cap_data (UAF)
CVE-2025-68304
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-2025-68304
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": "5af1f84ed13a416297ab9ced7537f4d5ae7f329a",
"lessThan": "ec74cdf77310c43b01b83ee898a9bd4b4b0b8e93",
"versionType": "git"
},
{
"status": "affected",
"version": "5af1f84ed13a416297ab9ced7537f4d5ae7f329a",
"lessThan": "79a2d4678ba90bdba577dc3af88cc900d6dcd5ee",
"versionType": "git"
},
{
"status": "affected",
"version": "cd55c13bbb3d093ae601aa97e588ed4c1390ebb1",
"versionType": "git"
},
{
"status": "affected",
"version": "4d3ca4a9aaf0aa798a6be372dc0fc3a29e37dd57",
"versionType": "git"
},
{
"status": "affected",
"version": "80265dd1d944c3f33e52375b5dbe654980bd2688",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.149",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.4.16",
"lessThan": "6.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.5.3",
"lessThan": "6.6",
"versionType": "semver"
}
],
"programFiles": [
"include/net/bluetooth/hci_core.h",
"net/bluetooth/hci_core.c",
"net/bluetooth/iso.c",
"net/bluetooth/l2cap_core.c",
"net/bluetooth/sco.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.17.11",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/bluetooth/hci_core.h",
"net/bluetooth/hci_core.c",
"net/bluetooth/iso.c",
"net/bluetooth/l2cap_core.c",
"net/bluetooth/sco.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-68304
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30738 · Revision 1
- Added to Heist Feed
- Publisher date