CVE-2026-80551

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privileges used to create the mdev.\nUI:N - Exploitation requires only the attacker's own guest channel program submission through normal passthrough I/O; no separate victim mount, click, or user action is needed once the device is assigned.\nS:C - Guest-supplied IDAL channel programs are parsed and translated in the host kernel during cp_prefetch(), so inconsistent IDAW handling crosses the guest-to-host VFIO device-passthrough boundary and can compromise the hypervisor and co-resident VMs.\nC:H - If the first IDAW changes between reads, idaw_nr can be under-counted and page_array_pin() may omit guest pages while hardware DMA still runs, enabling reads of unpinned host kernel memory and disclosure beyond the guest boundary.\nI:H - Mismatched IDAW sizing lets a guest craft channel programs that pin one set of pages but execute I/O against another, causing host memory corruption via misdirected DMA and supporting further arbitrary-write or control-flow hijack primitives.\nA:H - 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boundary and can compromise the hypervisor and co-resident VMs.\nC:H - If the first IDAW changes between reads, idaw_nr can be under-counted and page_array_pin() may omit guest pages while hardware DMA still runs, enabling reads of unpinned host kernel memory and disclosure beyond the guest boundary.\nI:H - Mismatched IDAW sizing lets a guest craft channel programs that pin one set of pages but execute I/O against another, causing host memory corruption via misdirected DMA and supporting further arbitrary-write or control-flow hijack primitives.\nA:H - Inconsistent IDAL translation can immediately fault the host kernel during page pinning or channel I/O completion, and repeated guest-triggered SSCH submissions can reliably panic or hang the hypervisor and all co-hosted VMs."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": 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{"bugzilla": {"description": "kernel: s390/vfio_ccw: Ensure first IDAW remains constant", "id": "2524505", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524505"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ns390/vfio_ccw: Ensure first IDAW remains constant\nThe first IDAW in a list does not need to be on a 2K/4K boundary\nlike all others, and so is read separately to accurately calculate\nthe size of the buffer needed to read the full IDAL.\nVerify that the address found in the first IDAW is unchanged between\nreads, to ensure a consistent set of IDAWs being worked with.", "A flaw was found in the Linux kernel's s390/vfio_ccw component. This vulnerability arises because the system does not ensure that the address in the first Indirect Data Address Word (IDAW) remains constant between reads. An attacker could potentially exploit this to cause the system to operate with an inconsistent set of IDAWs, leading to data integrity issues or system instability."], "name": "CVE-2026-80551", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80551\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80551\nhttps://lore.kernel.org/linux-cve-announce/2026082608-CVE-2026-80551-e413@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01aa26c672c0eb771de4aaa2a8ccf6055778887b,0d46c2565f173bcddcdcaf44a4f69789a20535e2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01aa26c672c0eb771de4aaa2a8ccf6055778887b,08ef2a82115690d6e229615872ac1731af732497)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01aa26c672c0eb771de4aaa2a8ccf6055778887b,fc59e9482117ebdccd6dc7fa8082f8b980fd021e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01aa26c672c0eb771de4aaa2a8ccf6055778887b,565bef268d75bf7df665bce6923a88cd0eb74592)"}}], "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": "[5.3,5.3]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.105,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.46,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.10,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-26T16:45:08.201845+00:00", "updated": "2026-08-28T17:45:04.143197+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}