Improper input validation in Linux kernel - CVE-2026-99022

Vulnerability identifier: #VU157475

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-99022

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to cause a denial of service by triggering a board reboot.

The vulnerability exists due to improper validation of readable register addresses in the Linux kernel LTC3676 regulator driver when processing register dumps through regmap debugfs. A local privileged user can read /sys/kernel/debug/regmap/2-003c/registers to trigger access to the write-only HRST register, causing a hard reset of the chip and rebooting the board.

The CLIRQ register at address 0x1f is also incorrectly treated as readable; reading it triggers the interrupt-clear command.

Linux kernel
SUSE Linux Micro
SUSE Linux Micro Extras
kernel-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-default-devel
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-default-devel - update to 6.4.0-159998.55.1
kernel-syms - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-default-debugsource - update to 6.4.0-159998.55.1
kernel-default-devel-debuginfo - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/199a62d70314d21f06a9a6faaa3ef54d0404910c
• https://git.kernel.org/stable/c/1fb0d58fd363b439b4faf08a16ee6ae38b575cd4
• https://git.kernel.org/stable/c/28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83
• https://git.kernel.org/stable/c/ca5d85335a8fa6e87b45629f1a07b412482cab17
• https://git.kernel.org/stable/c/fd376d83741118e0212f0da985889c1a98d9c827

• Improper input validation in Linux kernel regulator driver
• SUSE update for the Linux Kernel