CVE-2026-99022 regulator: ltc3676: don't read the write-only HRST and CLIRQ registers
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99022?
CVE-2026-99022 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
regulator: ltc3676: don't read the write-only HRST and CLIRQ registers
HRST (0x1e) and CLIRQ (0x1f) are write-only command strobes. Writing HRST triggers a hard reset of the chip and writing CLIRQ clears the interrupt; reading them returns nothing useful, and the read itself fires the command.
The result is that a plain register dump resets the board:
cat /sys/kernel/debug/regmap/2-003c/registers
walks every readable register, hits HRST, and the board reboots.
Split the callback back in two so HRST and CLIRQ stay writable but are no longer readable. The readable range is left unchanged (LTC3676_BUCK1 ... LTC3676_IRQSTAT).
Which versions are affected by CVE-2026-99022?
How do I fix CVE-2026-99022?
Upgrade to a fixed version.
Is CVE-2026-99022 being exploited?
There is no known exploitation of CVE-2026-99022 in the wild and no public exploit code.
Sources
Also known as AZL-110873, BELL-CVE-2026-99022, DEBIAN-CVE-2026-99022, GHSA-668q-74cv-frqc, UBUNTU-CVE-2026-99022.