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CVE-2026-89456

7.0 · HIGH

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 s…

Published Sep 11, 2026EPSS 0.15%

Overview

CVE-2026-89456 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/15ec03452c18e8d288e519837d21b308300d74b2Refgit.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46Refgit.kernel.org/stable/c/6fb5ba2e7e43173a3761e46f091070a8185efa14Refgit.kernel.org/stable/c/9e063165d3fe58db2a517717b830f17e82d03467Refgit.kernel.org/stable/c/ceafb262475ac6cb3a7d07b1102608be2b216b99Refgit.kernel.org/stable/c/d0a2f97d8c97134aa7f6a191940b7bab4bb42f5fRefgit.kernel.org/stable/c/d6b8778b1b82aa3a8dbf8612080f635b834bd16bRefgit.kernel.org/stable/c/f735b9710f0c8fe72c1060103e865f4ae678190b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89456?

CVE-2026-89456 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2026-89456?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89456?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89456?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89456 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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