CVE-2026-64434
HIGH 8.8 ALL-YEARSIn 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: | <TASK> | 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:332
Severe if exploited (CVSS 8.8), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 17th percentile
Impact if exploited
8.8CVSS 3.1 · HIGH · CNA
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Must sit on the same / adjacent network
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
Search GitHub now — results may be empty or unverified.
Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Weakness (CWE)
- CWE-416: Use After Free
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References and research data (JSON)
Vendor product assessments
Showing 32 of 274 vendor product statements; 242 omitted. Read the full vendor advisory.
kernel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel
- none available: Affected
kernel-64k-debug-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-64k-debug-devel
- none available: Affected
kernel-64k-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-64k-devel
- none available: Affected
kernel-abi-stablelists as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-abi-stablelists
- none available: Affected
kernel-debug-devel-matched as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-debug-devel-matched
- none available: Affected
kernel-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-devel
- none available: Affected
kernel-modules-extra as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-modules-extra
- none available: Affected
kernel-rt-64k-debug as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-64k-debug
- none available: Affected
kernel-rt-64k-debug-modules-extra as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-64k-debug-modules-extra
- none available: Affected
kernel-rt-core as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-core
- none available: Affected
kernel-rt-debug-modules as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-debug-modules
- none available: Affected
kernel-rt-modules as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-modules
- none available: Affected
kernel-tools-libs-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-tools-libs-devel
- none available: Affected
kernel-zfcpdump-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-zfcpdump-devel
- none available: Affected
kernel.src as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel?arch=src
- none available: Affected
rv as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/rv
- none available: Affected
kernel as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00python-perf as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/python-perf
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-rt-debug as a component of Red Hat Enterprise Linux 7 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-debug
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel.src as a component of Red Hat Enterprise Linux 7 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel?arch=src
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-debug-modules-internal as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-debug-modules-internal
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-debug-kvm
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-tools-libs as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-tools-libs
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-64k as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-64k
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-64k-modules as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-64k-modules
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-debug-modules-core as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-debug-modules-core
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-modules-extra as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-modules-extra
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-rt-64k-debug-modules-extra as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-64k-debug-modules-extra
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-rt-debug-devel as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-debug-devel
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-rt-modules-extra as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-modules-extra
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00kernel-zfcpdump-devel as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-zfcpdump-devel
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00rv as a component of Red Hat Enterprise Linux 9 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/rv
Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Linux | Linux Kernel | ≥ 5.10.259 and < 5.10.265 |
| Linux | Linux Kernel | ≥ 5.15.210 and < 5.15.216 |
| Linux | Linux Kernel | ≥ 6.1.176 and < 6.1.183 |
| Linux | Linux Kernel | ≥ 6.6.143 and < 6.6.145 |
| Linux | Linux Kernel | ≥ 6.12.93 and < 6.12.97 |
| Linux | Linux Kernel | ≥ 6.18.35 and < 6.18.39 |
| Linux | Linux Kernel | ≥ 7.0.12 and < 7.1 |
| Linux | Linux Kernel | ≥ 7.1.1 and < 7.1.4 |
| Linux | Linux Kernel | 7.1 |
| Linux | Linux Kernel | 7.1 |
| Linux | Linux Kernel | 7.1 |
All CVSS metrics
- HIGH 8.8 v3.1 · CNA Primary
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - HIGH 8.8 v3.1 · NVD Secondary
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Patches & mitigations
- https://git.kernel.org/stable/c/8f90405a4a6f1f1880dc07996b47bf57c712bd8a CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/8922c7940bae9ce4b1736dddb6362370793835c2 CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/91047a4396a8b1857a6f712a90cf33ec0012b189 CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/0b0e2bf39cf99e458d991b9df253727e036a7d7d CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/d3b739db5dc6f688a60d56da872fabaf65246032 CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/50c38d9f42a529691e4e67ea9cedf4f0bfc8d277 CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660 - https://git.kernel.org/stable/c/b66774b48dd98f07254951f74ea6f513efe7ff8b CVE record · Linux · Updated 2026-08-19T16:28:16.061Z
NVD · CVE-2026-64434 · Updated 2026-10-19T21:17:37.660
Advisories
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64434.json Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-48778 EUVD · EUVD-2026-48778
Technical & other
- https://access.redhat.com/security/cve/CVE-2026-64434 Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
- https://bugzilla.redhat.com/show_bug.cgi?id=2507150 Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-64434 Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
- https://nvd.nist.gov/vuln/detail/CVE-2026-64434 Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
- https://lore.kernel.org/linux-cve-announce/2026072537-CVE-2026-64434-91cc@gregkh/T Red Hat · CVE-2026-64434 · Updated 2026-08-05T14:15:00+00:00
Sources: NVD · CVE.org · All sources and attribution · EPSS