Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to conn->users. However, l2cap_register_user() and l2cap_unregister_user() don't use conn->lock, creating a race condition where these functions can access conn->users and conn->hchan concurrently with l2cap_conn_del(). This can lead to use-after-free and list corruption bugs, as reported by syzbot. Fix this by changing l2cap_register_user() and l2cap_unregister_user() to use conn->lock instead of hci_dev_lock(), ensuring consistent locking for the l2cap_conn structure.
CVE-2026-23461
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-2026-23461
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": "efc30877bd4bc85fefe98d80af60fafc86e5775e",
"lessThan": "11a87dd5df428a4b79a84d2790cac7f3c73f1f0d",
"versionType": "git"
},
{
"status": "affected",
"version": "f87271d21dd4ee83857ca11b94e7b4952749bbae",
"lessThan": "c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf",
"versionType": "git"
},
{
"status": "affected",
"version": "ab4eedb790cae44313759b50fe47da285e2519d5",
"lessThan": "da3000cbe4851458a22be38bb18c0689c39fdd5f",
"versionType": "git"
},
{
"status": "affected",
"version": "ab4eedb790cae44313759b50fe47da285e2519d5",
"lessThan": "71030f3b3015a412133a805ff47970cdcf30c2b8",
"versionType": "git"
},
{
"status": "affected",
"version": "ab4eedb790cae44313759b50fe47da285e2519d5",
"lessThan": "752a6c9596dd25efd6978a73ff21f3b592668f4a",
"versionType": "git"
},
{
"status": "affected",
"version": "18ab6b6078fa8191ca30a3065d57bf35d5635761",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.84",
"lessThan": "6.6.130",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.20",
"lessThan": "6.12.78",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.13.8",
"lessThan": "6.14",
"versionType": "semver"
}
],
"programFiles": [
"net/bluetooth/l2cap_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": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.10",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23461
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39860 · Revision 1
- Added to Heist Feed
- Publisher date