CVE-2026-64183

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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. 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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."}], "id": "CVE-2026-64183", "lastModified": "2026-11-06T17:18:39.427", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64183", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:31:34.725406Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:18:00.703", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: efi: Allocate runtime workqueue before ACPI init", "id": "2502622", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502622"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's EFI (Extensible Firmware Interface) runtime services. This vulnerability occurs due to a NULL pointer dereference when ACPI (Advanced Configuration and Power Interface) PRM (Platform Runtime Mechanism) calls are made before the necessary workqueue is allocated. This can lead to system instability or crashes, resulting in a denial of service."], "name": "CVE-2026-64183", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64183\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64183\nhttps://lore.kernel.org/linux-cve-announce/2026071939-CVE-2026-64183-ffa6@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5894cf571e14fb393a4d0a82538de032127b9d8b,29cd94e678fcb3c4fd0f359deeac6d61334323fc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5894cf571e14fb393a4d0a82538de032127b9d8b,6996e954ae830f5b793ba6cf449885ca519dbdd2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5894cf571e14fb393a4d0a82538de032127b9d8b,c32a1fbe0f9a48453a552bb315cc4f1e7a74084e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5894cf571e14fb393a4d0a82538de032127b9d8b,e871549f7894ad4114b3dd53f241aa25a268ba8b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5894cf571e14fb393a4d0a82538de032127b9d8b,13c6da02e767152c9ac4330962247a5e47011035)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.142,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.92,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T19:45:03.098467+00:00", "updated": "2026-07-30T20:15:05.532573+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}