CVE-2026-64183 (GCVE-0-2026-64183)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:41 – Updated: 2026-07-19 15:41
VLAI
Title
efi: Allocate runtime workqueue before ACPI init
Summary
In the Linux kernel, the following vulnerability has been resolved: efi: Allocate runtime workqueue before ACPI init Since commit 5894cf571e14 ("acpi/prmt: Use EFI runtime sandbox to invoke PRM handlers") ACPI PRM calls are delegated to a workqueue which runs in a kernel thread, making it easier to detect and mitigate faulting memory accesses performed by the firmware. Rafael reports that such PRM accesses may occur before efisubsys_init() executes, which is where the workqueue is allocated, leading to NULL pointer dereferences. Since acpi_init() [which triggers the early PRM accesses] executes as a subsys_initcall() as well, and has its own dependencies that may be sensitive to initcall ordering, deferring acpi_init() is not an option. So instead, split off the workqueue allocation into its own postcore initcall, as this is the only missing piece to allow EFI runtime calls to be made. This ensures that EFI runtime call (including PRM calls) are accessible to all code running at subsys_initcall() level.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5894cf571e14fb393a4d0a82538de032127b9d8b , < 29cd94e678fcb3c4fd0f359deeac6d61334323fc (git)
Affected: 5894cf571e14fb393a4d0a82538de032127b9d8b , < 6996e954ae830f5b793ba6cf449885ca519dbdd2 (git)
Affected: 5894cf571e14fb393a4d0a82538de032127b9d8b , < c32a1fbe0f9a48453a552bb315cc4f1e7a74084e (git)
Affected: 5894cf571e14fb393a4d0a82538de032127b9d8b , < e871549f7894ad4114b3dd53f241aa25a268ba8b (git)
Affected: 5894cf571e14fb393a4d0a82538de032127b9d8b , < 13c6da02e767152c9ac4330962247a5e47011035 (git)
Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/efi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "29cd94e678fcb3c4fd0f359deeac6d61334323fc",
              "status": "affected",
              "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
              "versionType": "git"
            },
            {
              "lessThan": "6996e954ae830f5b793ba6cf449885ca519dbdd2",
              "status": "affected",
              "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
              "versionType": "git"
            },
            {
              "lessThan": "c32a1fbe0f9a48453a552bb315cc4f1e7a74084e",
              "status": "affected",
              "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
              "versionType": "git"
            },
            {
              "lessThan": "e871549f7894ad4114b3dd53f241aa25a268ba8b",
              "status": "affected",
              "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
              "versionType": "git"
            },
            {
              "lessThan": "13c6da02e767152c9ac4330962247a5e47011035",
              "status": "affected",
              "version": "5894cf571e14fb393a4d0a82538de032127b9d8b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/efi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:41:05.896Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64183",
    "datePublished": "2026-07-19T15:41:05.896Z",
    "dateReserved": "2026-07-19T07:54:57.039Z",
    "dateUpdated": "2026-07-19T15:41:05.896Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64183",
      "date": "2026-07-20",
      "epss": "0.00164",
      "percentile": "0.0595"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64183\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:18:00.703\",\"lastModified\":\"2026-07-19T16:18:00.703\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/firmware/efi/efi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5894cf571e14fb393a4d0a82538de032127b9d8b\",\"lessThan\":\"29cd94e678fcb3c4fd0f359deeac6d61334323fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5894cf571e14fb393a4d0a82538de032127b9d8b\",\"lessThan\":\"6996e954ae830f5b793ba6cf449885ca519dbdd2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5894cf571e14fb393a4d0a82538de032127b9d8b\",\"lessThan\":\"c32a1fbe0f9a48453a552bb315cc4f1e7a74084e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5894cf571e14fb393a4d0a82538de032127b9d8b\",\"lessThan\":\"e871549f7894ad4114b3dd53f241aa25a268ba8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5894cf571e14fb393a4d0a82538de032127b9d8b\",\"lessThan\":\"13c6da02e767152c9ac4330962247a5e47011035\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/firmware/efi/efi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.