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CVE-2026-80921

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: vsie: zero stale crypto bits When shadowing crypto access bits from a format0 apcb (crycb 0 or 1), the bits 64..255…

Published Sep 9, 2026EPSS 0.13%

Overview

CVE-2026-80921 is a high-severity vulnerability. It was published on September 9, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

KVM: s390: vsie: zero stale crypto bits

When shadowing crypto access bits from a format0 apcb (crycb 0 or 1),

the bits 64..255 are unchanged from whatever is in the vsie page in the

crycb and thus in the apcb. This gives a nested guest potential access

to a device no longer available. Zero out the remaining bits.

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/087c19cc60a8caa1a08e1e434c8be2caf6c27733Refgit.kernel.org/stable/c/29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6Refgit.kernel.org/stable/c/34d5b5b646c91cfb9338d7a12c955a70ffb8c66bRefgit.kernel.org/stable/c/59d51550b5cb916bda037673a721a404b3b47a0dRefgit.kernel.org/stable/c/7d23489f51109e3ebba5b5db8c5f0185af7b7fdfRefgit.kernel.org/stable/c/935eeba276012916c76243e5cbb843efd8fdb75dRefgit.kernel.org/stable/c/d110b3297f11ef227098b8a82ade2d5f123b7d2fRefgit.kernel.org/stable/c/d4bcd2df6d0d2af916b4fe1a533958778ea7c45bRefgit.kernel.org/stable/c/f6079dca67eccb5eabef9f72437948c66dc5131f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80921?

CVE-2026-80921 is a high-severity vulnerability. It was published on September 9, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-80921?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2026-80921?

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-2026-80921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80921 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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