{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64512",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.793Z",
        "datePublished": "2026-07-25T08:52:04.423Z",
        "dateUpdated": "2026-08-17T04:57:03.207Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:57:03.207Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: CPPC: Suppress UBSAN warning caused by field misuse\n\nThe definition of reg->access_width changes depending on the\nreg->space_id type.  Type ACPI_ADR_SPACE_PLATFORM_COMM uses\naccess_width to indicate the PCC region, which can result in a UBSAN\nif the value is greater than 4.\n\nFor example:\n\n UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9\n shift exponent 32 is too large for 32-bit type 'int'\n CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)\n Hardware name: To be filled by O.E.M.\n Call trace:\n  ...(trimming)\n  ubsan_epilogue+0x10/0x48\n  __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0\n  cpc_write+0x4d0/0x670\n  cppc_set_perf+0x18c/0x490\n  cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]\n  ... (trimming)\n\nLets fix this by validating the region type, as well as whether\naccess_width has a value. Then since we are returning bit_width\ndirectly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting\nthe size."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/acpi/cppc_acpi.c"
                    ],
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                            "version": "4949affd5288b867cdf115f5b08d6166b2027f87",
                            "lessThan": "b54c4632946ae42f2b39ed38abd909bbf78cbcc2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01fc53be672acae37e611c80cc0b4f3939584de3",
                            "lessThan": "e904596ba6dd108534ffa15e3e46b2fe245145e2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1b890ae474d19800a6be1696df7fb4d9a41676e4",
                            "lessThan": "2fb80e962029000959f651665baa4838cc92eb99",
                            "status": "affected",
                            "versionType": "git"
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                            "lessThan": "37f28bf8f14672dfa395994e41fd778a63f0bf5c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
                            "lessThan": "f29dc6132d4968e39d8fa575d1a12e2c718ce57b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
                            "lessThan": "dc066bd13c860bb27d6ace511210e18b8064c1d9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
                            "lessThan": "1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.15.154",
                            "lessThan": "5.15.155",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.90",
                            "lessThan": "6.1.178",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.30",
                            "lessThan": "6.6.145",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.8.9",
                            "lessThan": "6.9",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/acpi/cppc_acpi.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.155",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.178",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.145",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.96",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.39",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.4",
                            "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": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "5.15.155"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99"
                },
                {
                    "url": "https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c"
                },
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                },
                {
                    "url": "https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1"
                }
            ],
            "title": "ACPI: CPPC: Suppress UBSAN warning caused by field misuse",
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}