VulnerabilityPublished 18 Oct 2026

CVE-2026-98473: Linux kernel · s390/vfio-ap: fix KVM GISC and page leak when queue removed from host config

Source GCVE Database

Authoritative record:CVE-2026-98473· Medium

Not known to be exploited · fixed in da69d3ac53490724eba0ade9deb4e539a6ae9034 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 16:00 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 da69d3ac53490724eba0ade9deb4e539a6ae9034, cf441a0db681dfad5e89b015d6be11365159d7a9, 65e05ec252a9b79e75930d3c4dd42d8877db04c5 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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-67g9-vc6v-4v6c

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.6.15 <6.7 >=6.7.3 <6.8	Fixed in da69d3ac53490724eba0ade9deb4e539a6ae9034 cf441a0db681dfad5e89b015d6be11365159d7a9 65e05ec252a9b79e75930d3c4dd42d8877db04c5 6.8 6.7 3c3433657c82f200dae36c29e2b80681c81b85be
LinuxLinux	Affected =6.8	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly handle the AP_RESPONSE_Q_NOT_AVAIL response code and to correct resource cleanup logic in the vfio-ap driver. Users should apply the official kernel updates that include this patch to resolve the issue. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's s390 vfio-ap subsystem related to KVM interrupt and page resource handling has been resolved. The issue involves improper handling of the AP_RESPONSE_Q_NOT_AVAIL response code during queue removal from the host's AP configuration when assigned to a mediated device. This leads to resource leaks of KVM GISC registration and pinned guest pages. Additionally, a logic flaw in resource cleanup could cause a potential double-free condition. The fix addresses these issues by properly handling the response codes and ensuring resources are freed correctly.

Impact

The vulnerability can lead to resource leaks in the KVM guest environment, specifically leaking KVM GISC registrations and pinned guest pages, which could degrade system stability or resource availability. Additionally, a potential double-free condition could cause kernel instability or crashes. There is no indication of direct code execution or privilege escalation from the provided information.

References

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