VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-90422: Linux kernel · clk: mediatek: pllfh: Fix IO remapping leak in register_pllfhs error path

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in fea0b4fd891a2af77b55e05b950e7ea55b5d234e : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fea0b4fd891a2af77b55e05b950e7ea55b5d234e, d35e45e5bad4fabcf122126402b6c6dcb4379672, 111235106099019b8a8d1947dc5c2674e0329ffa +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d7964de8a8ea800910fdd4e365c42a9e7d5c54aa, < fea0b4fd891a2af77b55e05b950e7ea55b5d234e	Fixed in fea0b4fd891a2af77b55e05b950e7ea55b5d234e
LinuxLinux	Affected ≥ d7964de8a8ea800910fdd4e365c42a9e7d5c54aa, < d35e45e5bad4fabcf122126402b6c6dcb4379672	Fixed in d35e45e5bad4fabcf122126402b6c6dcb4379672
LinuxLinux	Affected ≥ d7964de8a8ea800910fdd4e365c42a9e7d5c54aa, < 111235106099019b8a8d1947dc5c2674e0329ffa	Fixed in 111235106099019b8a8d1947dc5c2674e0329ffa
LinuxLinux	Affected ≥ d7964de8a8ea800910fdd4e365c42a9e7d5c54aa, < 540d91480bcb1b28a62d7023aa70947ea44c55b9	Fixed in 540d91480bcb1b28a62d7023aa70947ea44c55b9
LinuxLinux	Affected ≥ d7964de8a8ea800910fdd4e365c42a9e7d5c54aa, < 6e3e93bc718c4fea556d7ca5fba07ab3511c9918	Fixed in 6e3e93bc718c4fea556d7ca5fba07ab3511c9918
LinuxLinux	Affected =6.2	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: clk: mediatek: pllfh: Fix IO remapping leak in register_pllfhs error path When mtk_clk_register_pllfhs function fails to register a PLL, it unregisters all PLLs and cleans up itself in its error path before returning, so the function callers don't need to do it. But contrary to mtk_clk_unregister_pllfhs function, that does almost the same sequence, it does not free the IO memory mapped on fhctl node, leading to a leak. Fix this leak by factorizing the cleanup sequence in a new private function and use it both mtk_clk_register_pllfhs and mtk_clk_unregister_pllfhs functions. Also, change the loop index start value to avoid the -1 operation on index at each loop.

References

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