{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-40974",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Enforce hcall result buffer validity and size\n\nplpar_hcall(), plpar_hcall9(), and related functions expect callers to\nprovide valid result buffers of certain minimum size. Currently this\nis communicated only through comments in the code and the compiler has\nno idea.\n\nFor example, if I write a bug like this:\n\n  long retbuf[PLPAR_HCALL_BUFSIZE]; // should be PLPAR_HCALL9_BUFSIZE\n  plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, ...);\n\nThis compiles with no diagnostics emitted, but likely results in stack\ncorruption at runtime when plpar_hcall9() stores results past the end\nof the array. (To be clear this is a contrived example and I have not\nfound a real instance yet.)\n\nTo make this class of error less likely, we can use explicitly-sized\narray parameters instead of pointers in the declarations for the hcall\nAPIs. When compiled with -Warray-bounds[1], the code above now\nprovokes a diagnostic like this:\n\nerror: array argument is too small;\nis of size 32, callee requires at least 72 [-Werror,-Warray-bounds]\n   60 |                 plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf,\n      |                 ^                                   ~~~~~~\n\n[1] Enabled for LLVM builds but not GCC for now. See commit\n    0da6e5fd6c37 (\"gcc: disable '-Warray-bounds' for gcc-13 too\") and\n    related changes."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "1da177e4c3f4",
                                            "version_value": "acf2b80c31c3"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.19.317",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.4.279",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.10.221",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.15.162",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.1.96",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.36",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.9.7",
                                                        "lessThanOrEqual": "6.9.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.10",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
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                            }
                        ]
                    }
                }
            ]
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    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/acf2b80c31c37acab040baa3cf5f19fbd5140b18",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/acf2b80c31c37acab040baa3cf5f19fbd5140b18"
            },
            {
                "url": "https://git.kernel.org/stable/c/19c166ee42cf16d8b156a6cb4544122d9a65d3ca",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/19c166ee42cf16d8b156a6cb4544122d9a65d3ca"
            },
            {
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                "name": "https://git.kernel.org/stable/c/a8c988d752b3d98d5cc1e3929c519a55ef55426c"
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                "name": "https://git.kernel.org/stable/c/262e942ff5a839b9e4f3302a8987928b0c8b8a2d"
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                "name": "https://git.kernel.org/stable/c/8aa11aa001576bf3b00dcb8559564ad7a3113588"
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                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/aa6107dcc4ce9a3451f2d729204713783b657257"
            },
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                "url": "https://git.kernel.org/stable/c/ff2e185cf73df480ec69675936c4ee75a445c3e4",
                "refsource": "MISC",
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