Out-of-bounds read in Linux kernel - CVE-2026-74549

Vulnerability identifier: #VU143228

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74549

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 out-of-bounds read in nct6775_update_pwm() in the nct6775-core hwmon driver when iterating over pwm channels for nct6116 weight-control registers. A local user can trigger access to unsupported weight registers to cause a denial of service.

The issue affects nct6116 configurations where bits 3 or 4 of has_pwm are set, causing out-of-bounds values to be used as hardware register addresses for subsequent read and write operations.

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

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-334.0.0.235
bpftool - update to 5.10.0-334.0.0.235
bpftool-debuginfo - update to 5.10.0-334.0.0.235
kernel-debuginfo - update to 5.10.0-334.0.0.235
kernel-debugsource - update to 5.10.0-334.0.0.235
kernel-devel - update to 5.10.0-334.0.0.235
kernel-headers - update to 5.10.0-334.0.0.235
kernel-source - update to 5.10.0-334.0.0.235
kernel-tools - update to 5.10.0-334.0.0.235
kernel-tools-debuginfo - update to 5.10.0-334.0.0.235
kernel-tools-devel - update to 5.10.0-334.0.0.235
perf - update to 5.10.0-334.0.0.235
perf-debuginfo - update to 5.10.0-334.0.0.235
python3-perf - update to 5.10.0-334.0.0.235
python3-perf-debuginfo - update to 5.10.0-334.0.0.235
linux (Debian package) - update to 6.12.105-1

• https://git.kernel.org/stable/c/1b722740ac5c2b2070f9ba922f4e0f227faf0246
• https://git.kernel.org/stable/c/25b528816f5d83be5236dc182692369e8c9402b0
• https://git.kernel.org/stable/c/4ad2972ef0e1bd1018ad7a72661a4636ed7daecc
• https://git.kernel.org/stable/c/689082a4cb166a7ae9729f7b12339e69fdad6c52
• https://git.kernel.org/stable/c/d0b704e569ac3b8416d8e02270cdc9bf830ed395

• Out-of-bounds read in Linux kernel hwmon driver
• Debian update for linux
• openEuler 22.03 LTS SP4 update for kernel