--- id: CVE-2026-80921 title: |- 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 vs… summary: |- 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 vs… severity: high cvss: 8.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H' vendor: Linux product: Linux affected: - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < d110b3297f11ef227098b8a82ade2d5f123b7d2f - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < 59d51550b5cb916bda037673a721a404b3b47a0d - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < f6079dca67eccb5eabef9f72437948c66dc5131f - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < 087c19cc60a8caa1a08e1e434c8be2caf6c27733 - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < 7d23489f51109e3ebba5b5db8c5f0185af7b7fdf - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < 935eeba276012916c76243e5cbb843efd8fdb75d - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < d4bcd2df6d0d2af916b4fe1a533958778ea7c45b - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < 29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6 - >- Linux >= 6b79de4b056e5a2febc0c61233d8f0ad7868e49c < 34d5b5b646c91cfb9338d7a12c955a70ffb8c66b - Linux 4.20 published: '2026-09-09' updated: '2026-09-10' sourceUpdated: '2026-09-10T06:17:06.037' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80921' references: - url: 'https://git.kernel.org/stable/c/087c19cc60a8caa1a08e1e434c8be2caf6c27733' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/34d5b5b646c91cfb9338d7a12c955a70ffb8c66b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/59d51550b5cb916bda037673a721a404b3b47a0d' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/7d23489f51109e3ebba5b5db8c5f0185af7b7fdf' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/935eeba276012916c76243e5cbb843efd8fdb75d' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/d110b3297f11ef227098b8a82ade2d5f123b7d2f' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/d4bcd2df6d0d2af916b4fe1a533958778ea7c45b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/f6079dca67eccb5eabef9f72437948c66dc5131f' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80921.json - url: 'https://access.redhat.com/security/cve/CVE-2026-80921' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531066' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80921' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80921' - url: >- https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80921.mbox - url: 'https://access.redhat.com/errata/RHSA-2026:76738' - url: 'https://access.redhat.com/errata/RHSA-2026:76739' - url: 'https://access.redhat.com/errata/RHSA-2026:75747' - url: 'https://access.redhat.com/errata/RHSA-2026:75746' tags: - nvd - cve.org - csaf - vex - red-hat ingestedAt: '2026-09-09T17:16:03.090Z' epss: 0.00126 epssPercentile: 0.02248 patched: - 10base_smtv - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - enterprise_linux_codeready_linux_builder_v_9 - enterprise_linux_hidden_v_10 - enterprise_linux_real_time_for_nfv_v_10 - enterprise_linux_nfv_v_8 - enterprise_linux_real_time_for_nfv_v_9 - enterprise_linux_real_time_v_10 - enterprise_linux_rt_v_8 - enterprise_linux_real_time_v_9 cwe: - CWE-908 scores: nvd: 8.8 vendor: 7 --- ## Overview 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 Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:76738** · Red Hat · fixed in: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76738) - **RHSA-2026:76739** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76739) - **RHSA-2026:75747** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75747) - **RHSA-2026:75746** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:75746) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80921.json)