Answer in brief
CVE-2026-80921 records a High severity (CVSS 8.8) vulnerability in KVM: s390: vsie: zero stale crypto bits. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <d110b3297f11ef227098b8a82ade2d5f123b7d2f || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <59d51550b5cb916bda037673a721a404b3b47a0d || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <f6079dca67eccb5eabef9f72437948c66dc5131f || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <087c19cc60a8caa1a08e1e434c8be2caf6c27733 || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <7d23489f51109e3ebba5b5db8c5f0185af7b7fdf || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <935eeba276012916c76243e5cbb843efd8fdb75d || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <d4bcd2df6d0d2af916b4fe1a533958778ea7c45b || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6 || >=6b79de4b056e5a2febc0c61233d8f0ad7868e49c <34d5b5b646c91cfb9338d7a12c955a70ffb8c66b | d110b3297f11ef227098b8a82ade2d5f123b7d2f, 59d51550b5cb916bda037673a721a404b3b47a0d, f6079dca67eccb5eabef9f72437948c66dc5131f, 087c19cc60a8caa1a08e1e434c8be2caf6c27733, 7d23489f51109e3ebba5b5db8c5f0185af7b7fdf, 935eeba276012916c76243e5cbb843efd8fdb75d, d4bcd2df6d0d2af916b4fe1a533958778ea7c45b, 29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6, 34d5b5b646c91cfb9338d7a12c955a70ffb8c66b |
| Linux/Linuxgeneric | 4.20 | Not reported |
Published upstream
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 9, 2026
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.
Quoted source text, attributed separately from HOL analysis.