Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind hci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via hci_conn_timeout (disc_work) -> hci_proto_disconn_ind -> l2cap_disconn_ind. This is UAF if the l2cap_conn is deleted concurrently. disc_work is disabled sync in hci_conn_del(), so we cannot take hci_dev_lock in disc_work. Fix by using proto_lock to guard l2cap_data, in addition to hdev->lock which is held in other access paths.
CVE-2026-90256
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-2026-90256
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": "0fa448369c87e20b2aeaeaca0187d698dd61f791",
"versionType": "git"
},
{
"status": "affected",
"version": "f87271d21dd4ee83857ca11b94e7b4952749bbae",
"lessThan": "7c032b6d48a46634cbd58aaebad2638c00ad3b51",
"versionType": "git"
},
{
"status": "affected",
"version": "ab4eedb790cae44313759b50fe47da285e2519d5",
"lessThan": "b495a3a9b33bc4e4613e685bf5c96c136caa22d8",
"versionType": "git"
},
{
"status": "affected",
"version": "ab4eedb790cae44313759b50fe47da285e2519d5",
"lessThan": "2b66c83ff1751d6bd3201b3017206262ab46dc05",
"versionType": "git"
},
{
"status": "affected",
"version": "18ab6b6078fa8191ca30a3065d57bf35d5635761",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.84",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.20",
"lessThan": "6.12.114",
"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": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90256
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48645 · Revision 1
- Added to Heist Feed
- Publisher date