{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64183",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.039Z",
        "datePublished": "2026-07-19T15:41:05.896Z",
        "dateUpdated": "2026-07-19T15:41:05.896Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-07-19T15:41:05.896Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi: Allocate runtime workqueue before ACPI init\n\nSince commit\n\n  5894cf571e14 (\"acpi/prmt: Use EFI runtime sandbox to invoke PRM handlers\")\n\nACPI PRM calls are delegated to a workqueue which runs in a kernel\nthread, making it easier to detect and mitigate faulting memory accesses\nperformed by the firmware.\n\nRafael reports that such PRM accesses may occur before efisubsys_init()\nexecutes, which is where the workqueue is allocated, leading to NULL\npointer dereferences. Since acpi_init() [which triggers the early PRM\naccesses] executes as a subsys_initcall() as well, and has its own\ndependencies that may be sensitive to initcall ordering, deferring\nacpi_init() is not an option.\n\nSo instead, split off the workqueue allocation into its own postcore\ninitcall, as this is the only missing piece to allow EFI runtime calls\nto be made. This ensures that EFI runtime call (including PRM calls) are\naccessible to all code running at subsys_initcall() level."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/firmware/efi/efi.c"
                    ],
                    "versions": [
                        {
                            "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
                            "lessThan": "29cd94e678fcb3c4fd0f359deeac6d61334323fc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
                            "lessThan": "6996e954ae830f5b793ba6cf449885ca519dbdd2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
                            "lessThan": "c32a1fbe0f9a48453a552bb315cc4f1e7a74084e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
                            "lessThan": "e871549f7894ad4114b3dd53f241aa25a268ba8b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
                            "lessThan": "13c6da02e767152c9ac4330962247a5e47011035",
                            "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/firmware/efi/efi.c"
                    ],
                    "versions": [
                        {
                            "version": "6.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.142",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.92",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.34",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.11",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "6.6",
                                    "versionEndExcluding": "6.6.142"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.12.92"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.18.34"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "7.0.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035"
                }
            ],
            "title": "efi: Allocate runtime workqueue before ACPI init",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}