VulnerabilityPublished 23 Oct 2026

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

Source GCVE Database

Authoritative record:CVE-2026-99022· Medium

Not known to be exploited · fixed in fd376d83741118e0212f0da985889c1a98d9c827 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fd376d83741118e0212f0da985889c1a98d9c827, ca5d85335a8fa6e87b45629f1a07b412482cab17, 199a62d70314d21f06a9a6faaa3ef54d0404910c +2

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-668q-74cv-frqc

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 37b918a034feda1b1ef404acf003812f37ab8da2, < fd376d83741118e0212f0da985889c1a98d9c827	Fixed in fd376d83741118e0212f0da985889c1a98d9c827
LinuxLinux	Affected ≥ 37b918a034feda1b1ef404acf003812f37ab8da2, < ca5d85335a8fa6e87b45629f1a07b412482cab17	Fixed in ca5d85335a8fa6e87b45629f1a07b412482cab17
LinuxLinux	Affected ≥ 37b918a034feda1b1ef404acf003812f37ab8da2, < 199a62d70314d21f06a9a6faaa3ef54d0404910c	Fixed in 199a62d70314d21f06a9a6faaa3ef54d0404910c
LinuxLinux	Affected ≥ 37b918a034feda1b1ef404acf003812f37ab8da2, < 28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83	Fixed in 28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83
LinuxLinux	Affected ≥ 37b918a034feda1b1ef404acf003812f37ab8da2, < 1fb0d58fd363b439b4faf08a16ee6ae38b575cd4	Fixed in 1fb0d58fd363b439b4faf08a16ee6ae38b575cd4
LinuxLinux	Affected =4.9	Fixed in–

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).

References

Community reviews

Loading reviews…