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NVD / CVE Program· CNA Linux

CVE-2026-89921: KVM: s390: Zero initialize data structures for inject_pfault_token

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 134f235e0e8de54611a72d3cc3f63e5f31246baa, 3da26db3323cbccf509005fdbc4ebae842d323cd, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 134f235e0e8de54611a72d3cc3f63e5f31246baa, 3da26db3323cbccf509005fdbc4ebae842d323cd, 4e2c7f7cbc27418f9a290399b986c1b85ff93b90 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: KVM: s390: Zero initialize data structures for inject_pfault_token __kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of the on-stack struct kvm_s390_irq but the full ext substructure is copied into the cpu local variable on inject. ext_params and pad contain stale stack values. Interrupt delivery only uses ext_params2, so nothing leaks to the guest, but a host user can use the migration ioctls to get to the data. Fix by zero-initializing the irq struct. Do the same for the inti data structure.

—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 12th 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 · 0.2%

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

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  • 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

    • 3.19affected
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before 3da26db3323cbccf509005fdbc4ebae842d323cdaffected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before 5b0ae4443383fbacd905522f0c95ad6c85a3b43eaffected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before 7090818ba774d254eba80979c2d4da23d91de02faffected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before ab1a8a3c9971200938093370da4c67d4427c25f2affected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before b8abc760fa18a389319d977834a30550b3ec18e8affected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before 9b046de62b8098af6e2ba820b125ec9dc5f162c8affected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before 134f235e0e8de54611a72d3cc3f63e5f31246baaaffected · git
    • 383d0b050106abecb82f43101cac94fa423af5cd and later · before 4e2c7f7cbc27418f9a290399b986c1b85ff93b90affected · git
    • before 3.19not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-89919Sep 16, 2026 · KVM: s390: keyop: use mmu_lock to read gmap->asce
    31Monitor
  • ← EarlierCVE-2026-89920Sep 16, 2026 · KVM: s390: Fix memory corruption by not reinjecting CK machine checks
    31Monitor
  • Later →CVE-2026-89922Sep 16, 2026 · KVM: s390: Take srcu when importing watchpoint data
    31Monitor

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 Linux134f235e0e8de54611a72d3cc3f63e5f31246baaVendor (CNA)
Linux Linux3da26db3323cbccf509005fdbc4ebae842d323cdVendor (CNA)
Linux Linux4e2c7f7cbc27418f9a290399b986c1b85ff93b90Vendor (CNA)
Linux Linux5b0ae4443383fbacd905522f0c95ad6c85a3b43eVendor (CNA)
Linux Linux7090818ba774d254eba80979c2d4da23d91de02fVendor (CNA)
Linux Linux9b046de62b8098af6e2ba820b125ec9dc5f162c8Vendor (CNA)
Linux Linuxab1a8a3c9971200938093370da4c67d4427c25f2Vendor (CNA)
Linux Linuxb8abc760fa18a389319d977834a30550b3ec18e8Vendor (CNA)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.6-1 · Debian:14Package 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.

No dated events beyond publication.

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. Fix✗ → ✓

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References

Show all references (7 more)

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

All records