VulnerabilityPublished 18 Oct 2026

CVE-2026-98650: Linux kernel · KVM: s390: Fix potential races in dat skey functions

Source GCVE Database

Authoritative record:CVE-2026-98650· Medium

Not known to be exploited : upgrade to c958f0498891203fddf2764b28f8b102c6bfd719 or 27554b9505ddfc0aeab466aeb60929dfa17284c7 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 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c958f0498891203fddf2764b28f8b102c6bfd719, 27554b9505ddfc0aeab466aeb60929dfa17284c7

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-mmwf-2qgq-f8xq

What to do

Upgrade Linux kernel to c958f0498891203fddf2764b28f8b102c6bfd719 or 27554b9505ddfc0aeab466aeb60929dfa17284c7.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8e03e8316eb242af307d1c789d09f1a1457cf9a3, < c958f0498891203fddf2764b28f8b102c6bfd719	Fixed in c958f0498891203fddf2764b28f8b102c6bfd719
LinuxLinux	Affected ≥ 8e03e8316eb242af307d1c789d09f1a1457cf9a3, < 27554b9505ddfc0aeab466aeb60929dfa17284c7	Fixed in 27554b9505ddfc0aeab466aeb60929dfa17284c7
LinuxLinux	Affected =7.0	Fixed in–
Debiandebian/linux`pkg:deb/debian/linux`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 applied to the Linux kernel to address this race condition by using safer pointer access and retry logic. Users should update to the patched kernel version once available. No other mitigation steps are indicated.

Description

A race condition vulnerability in the Linux kernel's KVM s390 architecture code related to storage key functions has been fixed. The issue involves potential concurrent splitting of large pages leading to crashes due to improper handling of pointers in dat_cond_set_storage_key() and related functions. The fix involves safer pointer access using READ_ONCE and retrying operations if a race is detected.

References

Community reviews

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