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NVD / CVE Program· CNA Linux

CVE-2026-89457: s390/dasd: Guard sysfs discipline callbacks against unallocated private data

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 2a1780f9fc2493bd34c418a0be6fc58943afcecf, 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5, 4a042d8e5f34282577ece50515cea8bb1246914d.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2a1780f9fc2493bd34c418a0be6fc58943afcecf, 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5, 4a042d8e5f34282577ece50515cea8bb1246914d 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/dasd: Guard sysfs discipline callbacks against unallocated private data Several sysfs show/store handlers call a discipline callback that dereferences device->private, either directly or through the DASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline is assigned before check_device() allocates device->private, so an unprivileged read of one of these world-readable attributes in that window dereferences a NULL pointer and panics. Guard the dereference inside each callback that actually touches device->private.

—No exploit Fix available
Published
Sep 11, 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%

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  • 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 exploit code appears or is weaponized
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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

    • 5.3affected
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 644b666c202cce12ccfcf9ded67089b18f4f7659affected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 4a042d8e5f34282577ece50515cea8bb1246914daffected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before bd8b4572528f9604a13bf3c7c2a167f5cf222f72affected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 57db27ccc162afe0726cffec0ae62e410ed2d0e9affected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 536407b272402af679155910d7fdeeb4834eefb9affected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 6452c13646af7c13d7f6668b6690cfb2427e7f7baffected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5affected · git
    • c729696bcf8b23450043dd9c9972c15e53419ae4 and later · before 2a1780f9fc2493bd34c418a0be6fc58943afcecfaffected · git
    • before 5.3not 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-2026-89455Sep 11, 2026 · PCI: plda: Fix use-after-free of event IRQs during teardown
    0Monitor
  • ← EarlierCVE-2026-89456Sep 11, 2026 · s390/dasd: Propagate partial completion length across ERP recovery
    28Monitor
  • Later →CVE-2026-89458Sep 11, 2026 · s390/dasd: Do not complete a failed ESE read as successful
    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 Linux2a1780f9fc2493bd34c418a0be6fc58943afcecfVendor (CNA)
Linux Linux449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5Vendor (CNA)
Linux Linux4a042d8e5f34282577ece50515cea8bb1246914dVendor (CNA)
Linux Linux536407b272402af679155910d7fdeeb4834eefb9Vendor (CNA)
Linux Linux57db27ccc162afe0726cffec0ae62e410ed2d0e9Vendor (CNA)
Linux Linux644b666c202cce12ccfcf9ded67089b18f4f7659Vendor (CNA)
Linux Linux6452c13646af7c13d7f6668b6690cfb2427e7f7bVendor (CNA)
Linux Linuxbd8b4572528f9604a13bf3c7c2a167f5cf222f72Vendor (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✗ → ✓

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References

Show all references (7 more)

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

All records