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CVE-2026-99022

Linux: regulator: ltc3676: don't read the write-only HRST and CLIRQ registers

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in1fb0d58fd363b439b4faf08a16ee6ae38b575cd4Also 199a62d70314d21f06a9a6faaa3ef54d0404910c, 28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83CVE List
Published23 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 1fb0d58fd363b439b4faf08a16ee6ae38b575cd4LinuxCVE List
  • 199a62d70314d21f06a9a6faaa3ef54d0404910cLinuxCVE List
  • 28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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).

Text from CVE List

Affected versions 12

  • Linuxaffected: 37b918a034feda1b1ef404acf003812f37ab8da2 before fd376d83741118e0212f0da985889c1a98d9c827CVE List
  • Linuxaffected: 37b918a034feda1b1ef404acf003812f37ab8da2 before 1fb0d58fd363b439b4faf08a16ee6ae38b575cd4CVE List
  • Linuxaffected: 37b918a034feda1b1ef404acf003812f37ab8da2 before 199a62d70314d21f06a9a6faaa3ef54d0404910cCVE List
  • Linuxaffected: 37b918a034feda1b1ef404acf003812f37ab8da2 before ca5d85335a8fa6e87b45629f1a07b412482cab17CVE List
  • Linuxaffected: 37b918a034feda1b1ef404acf003812f37ab8da2 before 28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83CVE List
  • Linuxaffected: 4.9CVE List
  • Linuxunaffected: all versions before 4.9CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.57 through 6.18.*CVE List
  • Linuxunaffected: 7.2.11 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5