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CVE-2026-80921

KVM: s390: vsie: zero stale crypto bits

HIGH
8.8
CVSS Score
Published: September 9, 2026 at 04:19 PM UTC
Updated: October 19, 2026 at 09:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
4.206b79de4b056e5a2febc0c61233d8f0ad7868e49c
Vendor states this is fixed in 087c19cc60a8caa1a08e1e434c8be2caf6c27733 (fixed)
Vendor states this is fixed in 29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6 (fixed)
Vendor states this is fixed in 34d5b5b646c91cfb9338d7a12c955a70ffb8c66b (fixed)
Vendor states this is fixed in 59d51550b5cb916bda037673a721a404b3b47a0d (fixed)
Vendor states this is fixed in 7d23489f51109e3ebba5b5db8c5f0185af7b7fdf (fixed)
Vendor states this is fixed in 935eeba276012916c76243e5cbb843efd8fdb75d (fixed)
Vendor states this is fixed in d110b3297f11ef227098b8a82ade2d5f123b7d2f (fixed)
Vendor states this is fixed in d4bcd2df6d0d2af916b4fe1a533958778ea7c45b (fixed)
Vendor states this is fixed in f6079dca67eccb5eabef9f72437948c66dc5131f (fixed)
Vendor states this is fixed in 4.20 (unaffected)
Vendor states this is fixed in 5.10.269 (unaffected)
Vendor states this is fixed in 5.15.220 (unaffected)
Vendor states this is fixed in 6.1.187 (unaffected)
Vendor states this is fixed in 6.12.108 (unaffected)
Vendor states this is fixed in 6.18.49 (unaffected)
Vendor states this is fixed in 6.6.156 (unaffected)
Vendor states this is fixed in 7.1.13 (unaffected)
Vendor states this is fixed in 7.2.3 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)
Vendor states this is fixed in 7.3-rc1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (9)

Source: cverecord
https://git.kernel.org/stable/c/d110b3297f11ef227098b8a82ade2d5f123b7d2f
Source: cverecord
https://git.kernel.org/stable/c/59d51550b5cb916bda037673a721a404b3b47a0d
Source: cverecord
https://git.kernel.org/stable/c/f6079dca67eccb5eabef9f72437948c66dc5131f
Source: cverecord
https://git.kernel.org/stable/c/087c19cc60a8caa1a08e1e434c8be2caf6c27733
Source: cverecord
https://git.kernel.org/stable/c/7d23489f51109e3ebba5b5db8c5f0185af7b7fdf
Source: cverecord
https://git.kernel.org/stable/c/935eeba276012916c76243e5cbb843efd8fdb75d
Source: cverecord
https://git.kernel.org/stable/c/d4bcd2df6d0d2af916b4fe1a533958778ea7c45b
Source: cverecord
https://git.kernel.org/stable/c/29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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