{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80550",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.766Z",
        "datePublished": "2026-08-26T14:37:19.956Z",
        "dateUpdated": "2026-08-26T14:37:19.956Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-26T14:37:19.956Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Fix out of bounds check on CCW array\n\nThe routine ccwchain_calc_length() counts the number of channel\ncommand words (CCWs) that are chained together in a single channel\nprogram, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.\n\nThe loop itself is \"do..while (count < 257)\", and while the logic in\nis_cpa_within_range() correctly adjusts between the 0-index array of\nCCWs and the count of CCWs starting at 1, this means it would look\nat a possible 257th CCW before ending the loop and (correctly)\nreturning an error.\n\nFix this by restructuring the loop to break as soon as 256 CCWs\n(thus indexes 0-255) are examined, without looking at memory\noutside the range."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/s390/cio/vfio_ccw_cp.c"
                    ],
                    "versions": [
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "0282fb1c4b638eecfe2cc558092c460911d8f7e2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "907adc667d902fafbdb2d740d57b55bd025dc4cd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "af3f80ca4c8b17f20f9e588def076288fdb49e65",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "499a8a66b1598bfab97182aed15e0f1646074a3d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "4c2e1d359d7a2b82cdf3254e4e480af9417f99fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "d5d096cd9369e986d4e5153baa86b8b35c283e09",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
                            "lessThan": "a005b7f1a491ffda61bff0fd0f6548f8986fb977",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/s390/cio/vfio_ccw_cp.c"
                    ],
                    "versions": [
                        {
                            "version": "4.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.266",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.217",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.184",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.153",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.105",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.46",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.10",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "4.12",
                                    "versionEndExcluding": "5.10.266"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.12",
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                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.12",
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                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.12",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65"
                },
                {
                    "url": "https://git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977"
                }
            ],
            "title": "s390/vfio_ccw: Fix out of bounds check on CCW array",
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