Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref l2cap_chan_timeout() runs asynchronously and accesses chan->conn. If the connection is torn down while the timer is running or pending, chan->conn can be freed, leading to a use-after-free when the timer worker attempts to lock conn->lock: | BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline] | BUG: KASAN: slab-use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline] | BUG: KASAN: slab-use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:161 [inline] | BUG: KASAN: slab-use-after-free in mutex_lock+0x4f/0xa0 kernel/locking/mutex.c:318 | Write of size 8 at addr ffff8881298d9550 by task kworker/2:1/83 | | CPU: 2 UID: 0 PID: 83 Comm: kworker/2:1 Not tainted 7.1.0-rc6-next-20260601-dirty #6 PREEMPT(full) | Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 | Workqueue: events l2cap_chan_timeout | Call Trace: | | instrument_atomic_read_write include/linux/instrumented.h:112 [inline] | atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline] | __mutex_trylock_fast kernel/locking/mutex.c:161 [inline] | mutex_lock+0x4f/0xa0 kernel/locking/mutex.c:318 | l2cap_chan_timeout+0x5d/0x1b0 net/bluetooth/l2cap_core.c:422 | process_one_work kernel/workqueue.c:3326 [inline] | proc
CVE-2026-64434
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-2026-64434
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": [
{
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"version": "3634cbdc2eb414b69ffa752ddbe5e0458518e321",
"lessThan": "8f90405a4a6f1f1880dc07996b47bf57c712bd8a",
"versionType": "git"
},
{
"status": "affected",
"version": "e1c100e2d61bd8c718b7d91fe3e050780a9bf72d",
"lessThan": "32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b",
"versionType": "git"
},
{
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},
{
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"lessThan": "91047a4396a8b1857a6f712a90cf33ec0012b189",
"versionType": "git"
},
{
"status": "affected",
"version": "50dfec218808b148ab4247b1858031b7a32015c5",
"lessThan": "0b0e2bf39cf99e458d991b9df253727e036a7d7d",
"versionType": "git"
},
{
"status": "affected",
"version": "859d3ace791ed878ae9ba5522c7844d960da8f88",
"lessThan": "d3b739db5dc6f688a60d56da872fabaf65246032",
"versionType": "git"
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{
"status": "affected",
"version": "8c8e620467a7b51562dbcefbd1f09f288d7d710d",
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"versionType": "git"
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{
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"lessThan": "b66774b48dd98f07254951f74ea6f513efe7ff8b",
"versionType": "git"
},
{
"status": "affected",
"version": "7555fd885a0603f50e49a655850a1f2bd8a25398",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.259",
"lessThan": "5.10.265",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.210",
"lessThan": "5.15.216",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.176",
"lessThan": "6.1.183",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.143",
"lessThan": "6.6.145",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.93",
"lessThan": "6.12.97",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.35",
"lessThan": "6.18.39",
"versionType": "semver"
},
{
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"version": "7.0.12",
"lessThan": "7.1",
"versionType": "semver"
}
],
"programFiles": [
"include/net/bluetooth/l2cap.h",
"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": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*"
},
{
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"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/bluetooth/l2cap.h",
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64434
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41041 · Revision 1
- Added to Heist Feed
- Publisher date