VulnerabilityPublished 18 Oct 2026

CVE-2026-98476: Linux kernel · s390/cio: Fix NULL pointer dereference in ccw_device_get_util_str()

Source GCVE Database

Authoritative record:CVE-2026-98476· Medium

Not known to be exploited · fixed in dbf30e661ceb9a52c94c85719716391dcc29142a : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in dbf30e661ceb9a52c94c85719716391dcc29142a, c3bbcb32deecc06ebb1762398399b566d5ff2fc9, 44b16b02608058fc72198ac0205969f0f43065df +5

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-cfjv-hvgg-mwp9

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 199652309a4d6635fca19d7528d73ab9e219bd9a, < dbf30e661ceb9a52c94c85719716391dcc29142a	Fixed in dbf30e661ceb9a52c94c85719716391dcc29142a
LinuxLinux	Affected ≥ 199652309a4d6635fca19d7528d73ab9e219bd9a, < c3bbcb32deecc06ebb1762398399b566d5ff2fc9	Fixed in c3bbcb32deecc06ebb1762398399b566d5ff2fc9
LinuxLinux	Affected ≥ 199652309a4d6635fca19d7528d73ab9e219bd9a, < 44b16b02608058fc72198ac0205969f0f43065df	Fixed in 44b16b02608058fc72198ac0205969f0f43065df
LinuxLinux	Affected ≥ 199652309a4d6635fca19d7528d73ab9e219bd9a, < 27e396a89f76f742abdbe9f8c4a58a6e806fdf59	Fixed in 27e396a89f76f742abdbe9f8c4a58a6e806fdf59
LinuxLinux	Affected ≥ 199652309a4d6635fca19d7528d73ab9e219bd9a, < 9d8b21820caed9128945fffcedf03e2a4c21eee2	Fixed in 9d8b21820caed9128945fffcedf03e2a4c21eee2
LinuxLinux	Affected ≥ 199652309a4d6635fca19d7528d73ab9e219bd9a, < 5fc54e04dad90b15d0430118b3f288a1d64e66c9	Fixed in 5fc54e04dad90b15d0430118b3f288a1d64e66c9

AI-suggested

A fix has been implemented in the Linux kernel to add the missing NULL check. Users should apply the official kernel updates that include this fix. Since this is a kernel-level issue, updating to the patched kernel version is the recommended remediation. Patch status is not explicitly provided; users should consult the Linux kernel vendor or distribution advisory for the exact fixed versions and update accordingly.

Description

A NULL pointer dereference vulnerability in the Linux kernel's s390 architecture was fixed in the function ccw_device_get_util_str(). This issue occurs when the channel path registry entry for a CHPID is removed while the subchannel's PMCW still references that CHPID, causing a function to return NULL and leading to a NULL pointer dereference. The fix adds a missing NULL check before dereferencing the pointer.

References

Community reviews

Loading reviews…