VulnerabilityPublished 23 Oct 2026

CVE-2026-98938: Linux kernel · rust: irq: pass RegistrationInner as cookie to request_irq

Source GCVE Database

Authoritative record:CVE-2026-98938· Medium

Not known to be exploited : upgrade to 9a7931e847f338a687e96cde9f37e0cff83ddd84 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 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 9a7931e847f338a687e96cde9f37e0cff83ddd84

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-4546-wrv4-93xw

What to do

Upgrade Linux kernel to 9a7931e847f338a687e96cde9f37e0cff83ddd84.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 29e16fcd67ee5b1d0417a657294cf96fdf2f8df9, < 9a7931e847f338a687e96cde9f37e0cff83ddd84	Fixed in 9a7931e847f338a687e96cde9f37e0cff83ddd84
LinuxLinux	Affected =6.18	Fixed in–

AI-suggested

A fix is available and has been applied in the Linux kernel by ensuring RegistrationInner is fully initialized before being passed to request_irq. Users should update to the patched kernel versions containing commit ba268514ea14 or later. Since this is a kernel-level fix, applying the official kernel update is the recommended remediation.

Description

A vulnerability in the Linux kernel's Rust IRQ handling was resolved by changing how RegistrationInner is passed as a cookie to request_irq. The issue involved accessing uninitialized memory in the IRQ callback due to the IRQ being enabled before RegistrationInner was fully initialized. This flaw was fixed by ensuring RegistrationInner's fields are initialized before passing it as the IRQ cookie. The vulnerability does not affect mainline Linux kernels where a related commit removed the problematic pattern.

References

Community reviews

Loading reviews…