CVE-2026-80921 is a vulnerability in Linux Kernel
Published on September 9, 2026
KVM: s390: vsie: zero stale crypto bits
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.
Products Associated with CVE-2026-80921
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Affected Versions
Linux:- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below d110b3297f11ef227098b8a82ade2d5f123b7d2f is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below 59d51550b5cb916bda037673a721a404b3b47a0d is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below f6079dca67eccb5eabef9f72437948c66dc5131f is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below 087c19cc60a8caa1a08e1e434c8be2caf6c27733 is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below 7d23489f51109e3ebba5b5db8c5f0185af7b7fdf is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below 935eeba276012916c76243e5cbb843efd8fdb75d is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below d4bcd2df6d0d2af916b4fe1a533958778ea7c45b is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below 29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6 is affected.
- Version 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and below 34d5b5b646c91cfb9338d7a12c955a70ffb8c66b is affected.
- Version 4.20 is affected.
- Before 4.20 is unaffected.
- Version 5.10.269, <= 5.10.* is unaffected.
- Version 5.15.220, <= 5.15.* is unaffected.
- Version 6.1.187, <= 6.1.* is unaffected.
- Version 6.6.156, <= 6.6.* is unaffected.
- Version 6.12.108, <= 6.12.* is unaffected.
- Version 6.18.49, <= 6.18.* is unaffected.
- Version 7.1.13, <= 7.1.* is unaffected.
- Version 7.2.3, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.