VulnerabilityPublished 28 Oct 2026

CVE-2026-99189: Linux kernel · gpio: mxc: fix race between chained IRQ handler install and probe completion

Source GCVE Database

Authoritative record:CVE-2026-99189

Not known to be exploited · fixed in 261802c14e1a3281987ea8f106701e5ed9652f68 : update Linux kernel when convenient.

Data as of 28 Oct 2026, 13:43 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in 261802c14e1a3281987ea8f106701e5ed9652f68, 38d44f78f041ffe60c8e2443b99434a199e7541d, 6c1e035d881579a6e4ed1ce5feabb13d23e80a82

Exploitation evidence

Disclosed: evidence found.
CVE published 28 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-ghxr-2qfh-mxwc

What to do

Upgrade Linux kernel to 261802c14e1a3281987ea8f106701e5ed9652f68, 38d44f78f041ffe60c8e2443b99434a199e7541d or 6c1e035d881579a6e4ed1ce5feabb13d23e80a82.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b, < 261802c14e1a3281987ea8f106701e5ed9652f68	Fixed in 261802c14e1a3281987ea8f106701e5ed9652f68
LinuxLinux	Affected ≥ 5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b, < 38d44f78f041ffe60c8e2443b99434a199e7541d	Fixed in 38d44f78f041ffe60c8e2443b99434a199e7541d
LinuxLinux	Affected ≥ 5f6d1998adeb5374ef248b5ba2e2a0c30ab0f60b, < 6c1e035d881579a6e4ed1ce5feabb13d23e80a82	Fixed in 6c1e035d881579a6e4ed1ce5feabb13d23e80a82
LinuxLinux	Affected =6.6	Fixed in–

AI-suggested

A fix has been implemented that moves the chained IRQ handler installation to after all required data structures are initialized and the probe completes successfully. Users should apply the official Linux kernel updates that include this fix to prevent the race condition and dangling handler issues.

Description

A race condition vulnerability in the Linux kernel's gpio mxc driver was fixed. The issue involved installing a chained IRQ handler before the necessary IRQ domain and data structures were fully initialized, which could lead to the handler accessing incomplete or freed memory. This fix moves the handler installation to occur only after all dependencies are ready and the probe process completes successfully.

References

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