CVE-2026-80921

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80921", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.801Z", "datePublished": "2026-09-09T16:19:42.335Z", "dateUpdated": "2026-10-19T08:45:04.791Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:04.791Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: vsie: zero stale crypto bits\n\nWhen shadowing crypto access bits from a format0 apcb (crycb 0 or 1),\nthe bits 64..255 are unchanged from whatever is in the vsie page in the\ncrycb and thus in the apcb. This gives a nested guest potential access\nto a device no longer available. Zero out the remaining bits."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached when an s390 KVM guest executes the privileged SIE instruction (B2/14), intercepted through handle_instruction() to kvm_s390_handle_vsie() and setup_apcb10(); that is a local guest/KVM ioctl path with no network, Bluetooth, or USB exposure.\nAC:L - An L1 guest that first runs a FORMAT-2 nested SCB (setup_apcb11 fills all 256 APCB bits) and then a FORMAT-0/1 SCB on a recycled vsie page hits setup_apcb10() deterministically; get_vsie_page() reuses pages without clearing crycb, so leftover bits 64-255 persist with no race or uncontrolled memory layout.\nPR:L - SIE requires guest supervisor state, i.e. the tenant guest kernel or an unprivileged host kvm-group user running QEMU, not host root; kvm_s390_handle_vsie() has no host capability gate, and user namespaces cannot substitute for this path, so privileges stay Low rather than High.\nUI:N - The attacker guest issues SIE and uses the over-permissive shadow APCB itself; vsie page reuse and crycb shadowing run automatically inside KVM with no victim mount, click, or other user action.\nS:C - Leftover APCB bits grant a nested guest millicode-enforced access to host AP adapters/domains outside its delegated matrix, crossing the KVM nested-virt and vfio-ap passthrough boundary into another guest's or the host zcrypt authority, equivalent to an IOMMU/device isolation bypass.\nC:H - Unauthorized APQNs let the nested guest issue NQAP/DQAP against queues that may now belong to the host zcrypt stack or another tenant, disclosing cryptographic request/response data and key material on those adapters/domains.\nI:H - The nested guest can enqueue arbitrary AP requests and change hardware queue state on adapters and domains 64-255 that the current shadow should have cleared, corrupting crypto operations the host believes are exclusive to another consumer.\nA:H - With those leftover APQNs the nested guest can PQAP(ZAPQ)-reset or flood shared queues, denying host or sibling-guest crypto services (pkey, secure-key LUKS, openCryptoki) that depend on the same physical adapter/domain."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/s390/kvm/vsie.c"], "versions": [{"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "d110b3297f11ef227098b8a82ade2d5f123b7d2f", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "59d51550b5cb916bda037673a721a404b3b47a0d", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "f6079dca67eccb5eabef9f72437948c66dc5131f", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "087c19cc60a8caa1a08e1e434c8be2caf6c27733", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "7d23489f51109e3ebba5b5db8c5f0185af7b7fdf", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "935eeba276012916c76243e5cbb843efd8fdb75d", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "d4bcd2df6d0d2af916b4fe1a533958778ea7c45b", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6", "status": "affected", "versionType": "git"}, {"version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "lessThan": "34d5b5b646c91cfb9338d7a12c955a70ffb8c66b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/s390/kvm/vsie.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.49", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.13", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.3", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.10.269"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.220"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.187"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.108"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.49"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.1.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d110b3297f11ef227098b8a82ade2d5f123b7d2f"}, {"url": "https://git.kernel.org/stable/c/59d51550b5cb916bda037673a721a404b3b47a0d"}, {"url": "https://git.kernel.org/stable/c/f6079dca67eccb5eabef9f72437948c66dc5131f"}, {"url": "https://git.kernel.org/stable/c/087c19cc60a8caa1a08e1e434c8be2caf6c27733"}, {"url": "https://git.kernel.org/stable/c/7d23489f51109e3ebba5b5db8c5f0185af7b7fdf"}, {"url": "https://git.kernel.org/stable/c/935eeba276012916c76243e5cbb843efd8fdb75d"}, {"url": "https://git.kernel.org/stable/c/d4bcd2df6d0d2af916b4fe1a533958778ea7c45b"}, {"url": "https://git.kernel.org/stable/c/29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6"}, {"url": "https://git.kernel.org/stable/c/34d5b5b646c91cfb9338d7a12c955a70ffb8c66b"}], "title": "KVM: s390: vsie: zero stale crypto bits", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/s390/kvm/vsie.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d110b3297f11ef227098b8a82ade2d5f123b7d2f", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "59d51550b5cb916bda037673a721a404b3b47a0d", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "f6079dca67eccb5eabef9f72437948c66dc5131f", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "087c19cc60a8caa1a08e1e434c8be2caf6c27733", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "7d23489f51109e3ebba5b5db8c5f0185af7b7fdf", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "935eeba276012916c76243e5cbb843efd8fdb75d", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "d4bcd2df6d0d2af916b4fe1a533958778ea7c45b", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}, {"lessThan": "34d5b5b646c91cfb9338d7a12c955a70ffb8c66b", "status": "affected", "version": "6b79de4b056e5a2febc0c61233d8f0ad7868e49c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/s390/kvm/vsie.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"lessThan": "4.20", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.269", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.220", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.187", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.156", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.13", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: vsie: zero stale crypto bits\n\nWhen shadowing crypto access bits from a format0 apcb (crycb 0 or 1),\nthe bits 64..255 are unchanged from whatever is in the vsie page in the\ncrycb and thus in the apcb. This gives a nested guest potential access\nto a device no longer available. Zero out the remaining bits."}], "id": "CVE-2026-80921", "lastModified": "2026-10-19T09:17:22.950", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-09T17:17:47.240", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/087c19cc60a8caa1a08e1e434c8be2caf6c27733"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/34d5b5b646c91cfb9338d7a12c955a70ffb8c66b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59d51550b5cb916bda037673a721a404b3b47a0d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d23489f51109e3ebba5b5db8c5f0185af7b7fdf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/935eeba276012916c76243e5cbb843efd8fdb75d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d110b3297f11ef227098b8a82ade2d5f123b7d2f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d4bcd2df6d0d2af916b4fe1a533958778ea7c45b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6079dca67eccb5eabef9f72437948c66dc5131f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,d110b3297f11ef227098b8a82ade2d5f123b7d2f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,59d51550b5cb916bda037673a721a404b3b47a0d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,f6079dca67eccb5eabef9f72437948c66dc5131f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,087c19cc60a8caa1a08e1e434c8be2caf6c27733)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,7d23489f51109e3ebba5b5db8c5f0185af7b7fdf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,935eeba276012916c76243e5cbb843efd8fdb75d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,d4bcd2df6d0d2af916b4fe1a533958778ea7c45b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b79de4b056e5a2febc0c61233d8f0ad7868e49c,34d5b5b646c91cfb9338d7a12c955a70ffb8c66b)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.20"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.20)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.269,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.220,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.187,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.156,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.108,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.49,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.13,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.3,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-09T18:00:08.397472+00:00", "updated": "2026-09-11T18:45:13.230837+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-790", "CWE-269"]}