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

Assessment

Severity
Moderate
CVSS base score
4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Impact
Not stated
EPSS, next 30 days
Not scored yet
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Mariner
Weakness
—
Issued by
Linux
Published
25 Oct 2026 · October 2026
Last revised
26 Oct 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
LocalAV:L
Attack complexity
LowAC:L
Privileges required
HighPR:H
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

1 affected product
  • azl3 kernel 6.6.157.1-1 on Azure Linux 3.0
Page history

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Cite this version
Field-level log (0)

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No retained field changes for this selection.

Explore global source statements, affected packages and advisory history for CVE-2026-99022. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-99022

Published

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

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).

Source published
23 Oct 2026 12:21:03 UTC
Source modified
23 Oct 2026 12:21:03 UTC
Observed here
23 Oct 2026 16:01:20 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 28 Oct 03:56 UTC · 272 of 272 readable · 270 fully read · documentation 469/469 current