Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.
CVE-2026-74540
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-2026-74540
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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "15d6c2367217a6a20b1abae9f38ded716bf620f1",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "1818180fe12d6cec7a437bc59cde8efdf6b10250",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "8325eafb38c3dee5af329266393763693d17381b",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "fd4c1e301bdec60a40728ea37de531cbccda501a",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "522b730c62c53a1981604fd73524697fd347830d",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "09f447accc2570751e7d17f0dc0788b40d3edade",
"versionType": "git"
},
{
"status": "affected",
"version": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
"lessThan": "c4740e7f23ff9a8210198d8b4703259e21b9f69d",
"versionType": "git"
}
],
"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": "3.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74540
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33198 · Revision 1
- Added to Heist Feed
- Publisher date