Use-after-free in Linux kernel - CVE-2026-68198

Vulnerability identifier: #VU142109

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68198

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in aggr_reset_state() in the ath6kl wireless driver when handling a race between timer callback execution and TID state teardown. A local user can trigger the race condition to cause a denial of service.

The timer callback may continue accessing rx_tid[] and stat[] fields after the associated aggr_conn structure is freed, and it can re-arm itself while the reset routine is running.

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Live Patching
Ubuntu
kgraft-patch-4_12_14-122_328-default
kernel-default
kernel-default-man
kernel-macros
kernel-devel
kernel-source
kernel-default-devel-debuginfo
kernel-default-base
kernel-default-devel
cluster-md-kmp-default
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
dlm-kmp-default
ocfs2-kmp-default
kernel-default-base-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-syms
kernel-default-kgraft
kernel-default-debuginfo
kernel-default-kgraft-devel
kernel-default-debugsource
linux-nvidia-tegra (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kgraft-patch-4_12_14-122_328-default - update to 1-8.5.1
kernel-default - update to 4.12.14-122.328.1
kernel-default-man - update to 4.12.14-122.328.1
kernel-macros - update to 4.12.14-122.328.1
kernel-devel - update to 4.12.14-122.328.1
kernel-source - update to 4.12.14-122.328.1
kernel-default-devel-debuginfo - update to 4.12.14-122.328.1
kernel-default-base - update to 4.12.14-122.328.1
kernel-default-devel - update to 4.12.14-122.328.1
cluster-md-kmp-default - update to 4.12.14-122.328.1
gfs2-kmp-default - update to 4.12.14-122.328.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.328.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.328.1
dlm-kmp-default - update to 4.12.14-122.328.1
ocfs2-kmp-default - update to 4.12.14-122.328.1
kernel-default-base-debuginfo - update to 4.12.14-122.328.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.328.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.328.1
kernel-syms - update to 4.12.14-122.328.1
kernel-default-kgraft - update to 4.12.14-122.328.1
kernel-default-debuginfo - update to 4.12.14-122.328.1
kernel-default-kgraft-devel - update to 4.12.14-122.328.1
kernel-default-debugsource - update to 4.12.14-122.328.1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
linux (Debian package) - update to 6.12.105-1

• https://git.kernel.org/stable/c/18965470d41e69d3fc10eb62afae29d10f4cdfd1
• https://git.kernel.org/stable/c/64af6534a085f49d6ed33338a19ab9cf0d0523c9
• https://git.kernel.org/stable/c/a3313111b5d9046af60b370c93eec105b27380c1
• https://git.kernel.org/stable/c/b5d618fd61b9069b4c0a6b487022dd3117ad5acc
• https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d

• Use-after-free in Linux kernel ath ath6kl driver
• Debian update for linux
• SUSE update for the Linux Kernel
• Ubuntu update for linux-nvidia-tegra