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NVD / CVE Program· CNA Linux

CVE-2026-89456: s390/dasd: Propagate partial completion length across ERP recovery

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 15ec03452c18e8d288e519837d21b308300d74b2, 5.5, 5.6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 15ec03452c18e8d288e519837d21b308300d74b2, 5.5, 5.6 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: Propagate partial completion length across ERP recovery dasd_default_erp_postaction() copies the timing and device state from the finished ERP request back to the original request but drops proc_bytes. A request that was partially completed, an ESE read of a not-yet-allocated track returns fewer bytes than requested, and then recovered through the ERP chain loses its partial-completion length. __dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole request instead of requeueing the remainder, silently returning zeroed data for the part that was never read. Carry proc_bytes over to the original request like the other per-request state.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 4th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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

    • fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04, 5f7c9989f11305aaa43e0f4378f4f070022a9f2b, 5.6affected
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 9e063165d3fe58db2a517717b830f17e82d03467affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 6b0954c8a259da1e4aa745989f82723947acfb46affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before d0a2f97d8c97134aa7f6a191940b7bab4bb42f5faffected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before f735b9710f0c8fe72c1060103e865f4ae678190baffected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before d6b8778b1b82aa3a8dbf8612080f635b834bd16baffected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before ceafb262475ac6cb3a7d07b1102608be2b216b99affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 15ec03452c18e8d288e519837d21b308300d74b2affected · git
    • 5e6bdd37c5526ef01326df5dabb93011ee89237e and later · before 6fb5ba2e7e43173a3761e46f091070a8185efa14affected · 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-2026-89454Sep 11, 2026 · PCI: plda: Fix IRQ domain leaks in the error paths of plda_init_interrupts()
    0Monitor
  • ← EarlierCVE-2026-89455Sep 11, 2026 · PCI: plda: Fix use-after-free of event IRQs during teardown
    0Monitor
  • Later →CVE-2026-89457Sep 11, 2026 · s390/dasd: Guard sysfs discipline callbacks against unallocated private data
    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 Linux15ec03452c18e8d288e519837d21b308300d74b2Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5.6Vendor (CNA)
Linux Linux6b0954c8a259da1e4aa745989f82723947acfb46Vendor (CNA)
Linux Linux6fb5ba2e7e43173a3761e46f091070a8185efa14Vendor (CNA)
Linux Linux9e063165d3fe58db2a517717b830f17e82d03467Vendor (CNA)
Linux Linuxceafb262475ac6cb3a7d07b1102608be2b216b99Vendor (CNA)
Linux Linuxd0a2f97d8c97134aa7f6a191940b7bab4bb42f5fVendor (CNA)
Linux Linuxd6b8778b1b82aa3a8dbf8612080f635b834bd16bVendor (CNA)
Linux Linuxf735b9710f0c8fe72c1060103e865f4ae678190bVendor (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.

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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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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 (7 more)

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

All records