VulnerabilityPublished 18 Oct 2026

CVE-2026-98648: Linux kernel · s390/uv: Prevent potential out-of-bounds read

Source GCVE Database

Authoritative record:CVE-2026-98648· Medium

Not known to be exploited · fixed in f47190b08b71e8482072978373ee88cb2dfbdaf4 : 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 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f47190b08b71e8482072978373ee88cb2dfbdaf4, 116bba758533a139bbede8d717a1371bd6d890f6, 04bb5b2eb9f1d56110f14d3a4e31fa2c65fb026f

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-88ff-f8f3-f4qh

What to do

Upgrade Linux kernel to f47190b08b71e8482072978373ee88cb2dfbdaf4, 116bba758533a139bbede8d717a1371bd6d890f6 or 04bb5b2eb9f1d56110f14d3a4e31fa2c65fb026f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7c9137af2042e0d67aae0ccd84afc8ffc4b0d95d, < f47190b08b71e8482072978373ee88cb2dfbdaf4	Fixed in f47190b08b71e8482072978373ee88cb2dfbdaf4
LinuxLinux	Affected ≥ 7c9137af2042e0d67aae0ccd84afc8ffc4b0d95d, < 116bba758533a139bbede8d717a1371bd6d890f6	Fixed in 116bba758533a139bbede8d717a1371bd6d890f6
LinuxLinux	Affected ≥ 7c9137af2042e0d67aae0ccd84afc8ffc4b0d95d, < 04bb5b2eb9f1d56110f14d3a4e31fa2c65fb026f	Fixed in 04bb5b2eb9f1d56110f14d3a4e31fa2c65fb026f
LinuxLinux	Affected =6.13	Fixed in–

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel. Users should apply the official kernel updates that include this correction. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel s390/uv subsystem could cause an out-of-bounds read when the system has more than 85 secrets. This occurs because the uv_secret_list struct array holds only up to 85 items per page, but the code incorrectly loops over the overall count of secrets rather than the per sub-list count. This flaw has been resolved by correcting the loop to use the per sub-list count of stored secrets.

References

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