Out-of-bounds read in Linux kernel - CVE-2026-43172

Vulnerability identifier: #VU130564

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-2026-43172

CWE-ID: CWE-125

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 an out-of-bounds read in the SMEM parsing logic when processing firmware-reported LMAC configuration data. A local user can provide crafted firmware data to cause a denial of service.

Exploitation requires the firmware to report three LMACs, a condition that does not exist in hardware.

Linux kernel
Debian Linux
openEuler
Ubuntu
linux-nvidia-tegra (Ubuntu package)
bpftool
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
bpftool - update to 6.6.0-145.1.20.157
python3-perf-debuginfo - update to 6.6.0-145.1.20.157
python3-perf - update to 6.6.0-145.1.20.157
perf-debuginfo - update to 6.6.0-145.1.20.157
perf - update to 6.6.0-145.1.20.157
kernel-tools-devel - update to 6.6.0-145.1.20.157
kernel-tools-debuginfo - update to 6.6.0-145.1.20.157
kernel-tools - update to 6.6.0-145.1.20.157
kernel-source - update to 6.6.0-145.1.20.157
kernel-headers - update to 6.6.0-145.1.20.157
kernel-devel - update to 6.6.0-145.1.20.157
kernel-debugsource - update to 6.6.0-145.1.20.157
kernel-debuginfo - update to 6.6.0-145.1.20.157
bpftool-debuginfo - update to 6.6.0-145.1.20.157
kernel - update to 6.6.0-145.1.20.157
linux (Debian package) - update to 6.12.115-2

• https://git.kernel.org/stable/c/1d49a42717bdc8de77eabeb5b7d3e88d141ffea9
• https://git.kernel.org/stable/c/2b4b1510aaaf5b9fb57327ecffc20c055f61f205
• https://git.kernel.org/stable/c/58192b9ce09b0f0f86e2036683bd542130b91a98

• Out-of-bounds read in Linux kernel iwlwifi fw driver
• openEuler 24.03 LTS SP1 update for kernel
• Ubuntu update for linux-nvidia-tegra
• Debian update for linux