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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 27e396a89f76f742abdbe9f8c4a58a6e806fdf59, 44b16b02608058fc72198ac0205969f0f43065df, 5b76268dac968612f7283d59b539036de955b7d9; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 27e396a89f76f742abdbe9f8c4a58a6e806fdf59, 44b16b02608058fc72198ac0205969f0f43065df, 5b76268dac968612f7283d59b539036de955b7d9; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: s390/cio: Fix NULL pointer dereference in ccw_device_get_util_str() The channel path registry entry associated with a CHPID may be removed while the subchannel's PMCW still references that CHPID. In this case, chpid_to_chp() can return NULL, leading to a NULL pointer dereference. Add the missing NULL check before dereferencing the returned pointer.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.18affected
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before 9d8b21820caed9128945fffcedf03e2a4c21eee2affected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before 5fc54e04dad90b15d0430118b3f288a1d64e66c9affected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before 27e396a89f76f742abdbe9f8c4a58a6e806fdf59affected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before dbf30e661ceb9a52c94c85719716391dcc29142aaffected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before 5e006ac90a4d331db1dd712b91fec849b45ffc01affected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before c3bbcb32deecc06ebb1762398399b566d5ff2fc9affected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before 44b16b02608058fc72198ac0205969f0f43065dfaffected · git
    • 199652309a4d6635fca19d7528d73ab9e219bd9a and later · before 5b76268dac968612f7283d59b539036de955b7d9affected · git
    • before 4.18not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98474Oct 18, 2026 · s390/pci: Fix missing device lock in zpci_report_status()
    0Monitor
  • ← EarlierCVE-2026-98475Oct 18, 2026 · s390/cmf: Fix virtual vs physical address confusion
    0Monitor
  • Later →CVE-2026-98477Oct 18, 2026 · perf/core: Fix NULL pmu_ctx passed to pmu->sched_task()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux27e396a89f76f742abdbe9f8c4a58a6e806fdf59Vendor (CNA)
Linux Linux44b16b02608058fc72198ac0205969f0f43065dfVendor (CNA)
Linux Linux5b76268dac968612f7283d59b539036de955b7d9Vendor (CNA)
Linux Linux5e006ac90a4d331db1dd712b91fec849b45ffc01Vendor (CNA)
Linux Linux5fc54e04dad90b15d0430118b3f288a1d64e66c9Vendor (CNA)
Linux Linux9d8b21820caed9128945fffcedf03e2a4c21eee2Vendor (CNA)
Linux Linuxc3bbcb32deecc06ebb1762398399b566d5ff2fc9Vendor (CNA)
Linux Linuxdbf30e661ceb9a52c94c85719716391dcc29142aVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 4, 2026+17 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records