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CVE-2026-99022: regulator: ltc3676: don't read the write-only HRST and CLIRQ registers

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-30

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).

Affected products

• Linux: 4.9 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0893de2397d85547d4b88379044aa541b07b56af
• 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/4cc1e849bb7dd8deb37f6a51e1aaf725e2016595
• https://git.kernel.org/stable/c/ca5d85335a8fa6e87b45629f1a07b412482cab17
• https://git.kernel.org/stable/c/f8b0ccdcf3ca7cf6e4c2c400e80f81a727f768c7
• https://git.kernel.org/stable/c/fd376d83741118e0212f0da985889c1a98d9c827

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