VulnerabilityPublished 23 Oct 2026

CVE-2026-98930: Linux kernel · KVM: s390: Fix IRQ injection with SIGP Stop and Store Status

Source GCVE Database

Authoritative record:CVE-2026-98930· Medium

Not known to be exploited · fixed in d343407b728a80b74be3c24b59f15e60289ea527 : 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 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d343407b728a80b74be3c24b59f15e60289ea527, d0e3bf633f0585a0c2c2105ea7723777d764fae5, a379ac504fcb8c6fc2aa36203f5489b9581eb2e0 +1

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-hqr4-mv6v-vc35

What to do

Upgrade Linux kernel to d343407b728a80b74be3c24b59f15e60289ea527, d0e3bf633f0585a0c2c2105ea7723777d764fae5, a379ac504fcb8c6fc2aa36203f5489b9581eb2e0 or 3bd77c59576b1d447fd56cc689ae9523a334b924.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6cddd432e3da5e25eccbc13844d03c871674a62e, < d343407b728a80b74be3c24b59f15e60289ea527	Fixed in d343407b728a80b74be3c24b59f15e60289ea527
LinuxLinux	Affected ≥ 6cddd432e3da5e25eccbc13844d03c871674a62e, < d0e3bf633f0585a0c2c2105ea7723777d764fae5	Fixed in d0e3bf633f0585a0c2c2105ea7723777d764fae5
LinuxLinux	Affected ≥ 6cddd432e3da5e25eccbc13844d03c871674a62e, < a379ac504fcb8c6fc2aa36203f5489b9581eb2e0	Fixed in a379ac504fcb8c6fc2aa36203f5489b9581eb2e0
LinuxLinux	Affected ≥ 6cddd432e3da5e25eccbc13844d03c871674a62e, < 3bd77c59576b1d447fd56cc689ae9523a334b924	Fixed in 3bd77c59576b1d447fd56cc689ae9523a334b924
LinuxLinux	Affected =4.0	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix IRQ injection with SIGP Stop and Store Status When __inject_sigp_stop() is called for a Stop and Store Status operation, if the vCPU is running, the interrupt is marked as pending and the status is stored by the thread performing the KVM_RUN IOCTL. If the vCPU is already stopped, the status is stored immediately. Storing the status means writing into userspace, which might fault, and __inject_sigp_stop() is called from do_inject_vcpu() which in turn is always called holding a spinlock, which is obviously an issue. Fix this by returning -EWOULDBLOCK from __inject_sigp_stop(), and adding a bool flag to indicate whether a store status is needed. The callers of do_inject_vcpu() are modified to pass the pointer to the bool flag; whenever a Store Status operation is needed, the callers can now perform it outside the spinlock. Opportunistically refactor kvm_s390_set_irq_state() to use scoped_guard() and __free(). [ Added Fixes tag while picking -- Claudio ]

References

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