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NVD / CVE Program· CNA Linux

CVE-2026-89926: KVM: s390: Fix length check __import_wp_info()

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 3fe801db90bdeefb0bbdda42d832846b53f64f8a, 4c07680a467e2f7697245bcd11691bffb2a6f0ed, 71153d3262517e1c02c3a66aa5094f279b2d1454.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3fe801db90bdeefb0bbdda42d832846b53f64f8a, 4c07680a467e2f7697245bcd11691bffb2a6f0ed, 71153d3262517e1c02c3a66aa5094f279b2d1454 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: Fix length check __import_wp_info() struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user space. This is then assigned to wp_info->len, which is an int. The bounds check is done on the truncated value while the allocation uses the untruncated one: wp_info->len = bp_data->len; [...] if (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE) return -EINVAL; wp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT); Use the validated value for the allocation as intended. Without this fix userspace can trigger >4GB allocations which will fail and result in a WARN due to MAX_PAGE_ORDER.

—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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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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

    • 3.16affected
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before aef540194effd768bed0bd2e6a74fe135a3d7c3aaffected · git
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before 71153d3262517e1c02c3a66aa5094f279b2d1454affected · git
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before fec89d327d9b2b669b5bbdac209386c6317c3722affected · git
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before b94ab9caa5d72c78226121cccff5e33f946da900affected · git
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before beb9c55af609c4c7308259d7191688c75a4e3d4aaffected · git
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before 3fe801db90bdeefb0bbdda42d832846b53f64f8aaffected · git
    • 27291e2165b6de70c476b7b675308113edd69a60 and later · before 4c07680a467e2f7697245bcd11691bffb2a6f0edaffected · git
    • before 3.16not affected · semver
    • 5.15.221 and later · up to and including 5.15.*not 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 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
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-2026-89924Sep 16, 2026 · KVM: s390: Fix old_data leak in guest debug error path
    0Monitor
  • ← EarlierCVE-2026-89925Sep 16, 2026 · KVM: s390: Fix memory leak in guest debug handling
    0Monitor
  • Later →CVE-2026-89927Sep 16, 2026 · KVM: x86: hyper-v: Clamp stimer deadline to avoid livelock
    28Monitor

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 Linux3fe801db90bdeefb0bbdda42d832846b53f64f8aVendor (CNA)
Linux Linux4c07680a467e2f7697245bcd11691bffb2a6f0edVendor (CNA)
Linux Linux71153d3262517e1c02c3a66aa5094f279b2d1454Vendor (CNA)
Linux Linuxaef540194effd768bed0bd2e6a74fe135a3d7c3aVendor (CNA)
Linux Linuxb94ab9caa5d72c78226121cccff5e33f946da900Vendor (CNA)
Linux Linuxbeb9c55af609c4c7308259d7191688c75a4e3d4aVendor (CNA)
Linux Linuxfec89d327d9b2b669b5bbdac209386c6317c3722Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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✗ → ✓

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

References

Show all references (6 more)

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

All records