VulnerabilityPublished 18 Oct 2026

CVE-2026-98649: Linux kernel · KVM: s390: Fix race in _destroy_pages_crste()

Source GCVE Database

Authoritative record:CVE-2026-98649

Not known to be exploited : upgrade to 90bd832b2bc367991d424d847003ce345b454ffc or 4ca00a9154f998116fba9a32cce5bd938d228065 when convenient.

Data as of 26 Oct 2026, 14:05 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 90bd832b2bc367991d424d847003ce345b454ffc, 4ca00a9154f998116fba9a32cce5bd938d228065

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-rw83-2w75-m53r

What to do

Upgrade Linux kernel to 90bd832b2bc367991d424d847003ce345b454ffc or 4ca00a9154f998116fba9a32cce5bd938d228065.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a2c17f9270cc3f1c55c35e8b1d151f41d75b40f5, < 90bd832b2bc367991d424d847003ce345b454ffc	Fixed in 90bd832b2bc367991d424d847003ce345b454ffc
LinuxLinux	Affected ≥ a2c17f9270cc3f1c55c35e8b1d151f41d75b40f5, < 4ca00a9154f998116fba9a32cce5bd938d228065	Fixed in 4ca00a9154f998116fba9a32cce5bd938d228065
LinuxLinux	Affected =7.0	Fixed in–
Red Hatredhat/kernel`pkg:rpm/redhat/kernel`Other threats	Affected =7.0	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel by applying READ_ONCE() in the _destroy_pages_crste() function. Users should update their Linux kernel to a version that includes this fix. No additional mitigation steps are indicated.

Description

A race condition vulnerability in the Linux kernel's KVM s390 subsystem was fixed by using READ_ONCE() in the _destroy_pages_crste() function to prevent multiple dereferences of a pointer. This fix addresses a concurrency issue that could lead to inconsistent behavior during page destruction.

References

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