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CVE-2026-89458· NVD / CVE Program· CNA Linux

s390/dasd: Do not complete a failed ESE read as successful

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 5.5, 5.6, 52b331c99baac653ca794bd8487c8ec4de8db203.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 5.5, 5.6, 52b331c99baac653ca794bd8487c8ec4de8db203 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: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.

—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th 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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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

    • fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04, 5f7c9989f11305aaa43e0f4378f4f070022a9f2b, 5.6affected
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 8cb96cffceead3cbd0541154d7ecc5e6474edda1affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 77168af195d04b34c6de62b874624e74d64cef8daffected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 921ff697bb6f7067059793becf8b2d00de71ce41affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 55f4df40178cdfede0d7ae848fbab00efa9b95c1affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before c9adf8399732306dfc97b3adb4778038743e3f5eaffected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 52b331c99baac653ca794bd8487c8ec4de8db203affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before b0d94dd6e82df396e2254c8b0f25eff7d19c2e7faffected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before cddb447c62466f3076938ce120028d7b591f9f37affected · git
    • 5.4.26 and later · before 5.5affected · 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-2026-89456Sep 11, 2026 · s390/dasd: Propagate partial completion length across ERP recovery
    28Monitor
  • ← EarlierCVE-2026-89457Sep 11, 2026 · s390/dasd: Guard sysfs discipline callbacks against unallocated private data
    0Monitor
  • Later →CVE-2026-89459Sep 11, 2026 · s390/percpu: Fix MVIY_PERCPU() with older binutils
    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 Linux5.5Vendor (CNA)
Linux Linux5.6Vendor (CNA)
Linux Linux52b331c99baac653ca794bd8487c8ec4de8db203Vendor (CNA)
Linux Linux55f4df40178cdfede0d7ae848fbab00efa9b95c1Vendor (CNA)
Linux Linux77168af195d04b34c6de62b874624e74d64cef8dVendor (CNA)
Linux Linux8cb96cffceead3cbd0541154d7ecc5e6474edda1Vendor (CNA)
Linux Linux921ff697bb6f7067059793becf8b2d00de71ce41Vendor (CNA)
Linux Linuxb0d94dd6e82df396e2254c8b0f25eff7d19c2e7fVendor (CNA)
Linux Linuxc9adf8399732306dfc97b3adb4778038743e3f5eVendor (CNA)
Linux Linuxcddb447c62466f3076938ce120028d7b591f9f37Vendor (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