CVE-2026-64512

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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"], "versions": [{"version": "4949affd5288b867cdf115f5b08d6166b2027f87", "lessThan": "b54c4632946ae42f2b39ed38abd909bbf78cbcc2", "status": "affected", "versionType": "git"}, {"version": "01fc53be672acae37e611c80cc0b4f3939584de3", "lessThan": "e904596ba6dd108534ffa15e3e46b2fe245145e2", "status": "affected", "versionType": "git"}, {"version": "1b890ae474d19800a6be1696df7fb4d9a41676e4", "lessThan": "2fb80e962029000959f651665baa4838cc92eb99", "status": "affected", "versionType": "git"}, {"version": "2f4a4d63a193be6fd530d180bb13c3592052904c", "lessThan": "37f28bf8f14672dfa395994e41fd778a63f0bf5c", "status": "affected", "versionType": "git"}, {"version": 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{"type": "ssvc", "content": {"id": "CVE-2026-64512", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:40:51.386689Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:44:56.109Z"}}]}}

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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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.155", "versionStartIncluding": "5.15.154"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "6.1.90"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "6.6.30"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.96", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.8.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:57:03.207Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64512", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:44:56.109Z", "dateReserved": "2026-07-19T15:36:31.793Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-25T08:52:04.423Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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."}], "id": "CVE-2026-64512", "lastModified": "2026-11-06T17:18:58.603", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64512", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:40:51.386689Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:37.380", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: ACPI: CPPC: Suppress UBSAN warning caused by field misuse", "id": "2507298", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507298"}, "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-1335", "details": ["A flaw was found in the Linux kernel's Advanced Configuration and Power Interface (ACPI) Collaborative Processor Performance Control (CPPC) module. A field misuse related to register access width can lead to a \"shift-out-of-bounds\" error. This undefined behavior could potentially cause system instability or a denial of service, which may be triggered by a local user."], "name": "CVE-2026-64512", "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"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64512\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64512\nhttps://lore.kernel.org/linux-cve-announce/2026072555-CVE-2026-64512-01fe@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4949affd5288b867cdf115f5b08d6166b2027f87,b54c4632946ae42f2b39ed38abd909bbf78cbcc2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01fc53be672acae37e611c80cc0b4f3939584de3,e904596ba6dd108534ffa15e3e46b2fe245145e2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1b890ae474d19800a6be1696df7fb4d9a41676e4,2fb80e962029000959f651665baa4838cc92eb99)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2f4a4d63a193be6fd530d180bb13c3592052904c,37f28bf8f14672dfa395994e41fd778a63f0bf5c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2f4a4d63a193be6fd530d180bb13c3592052904c,f29dc6132d4968e39d8fa575d1a12e2c718ce57b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2f4a4d63a193be6fd530d180bb13c3592052904c,dc066bd13c860bb27d6ace511210e18b8064c1d9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2f4a4d63a193be6fd530d180bb13c3592052904c,1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1,6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.154,5.15.155)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.90,6.1.178)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.30,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.8.9,6.9)"}}], "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": "semver", "value": "[6.9,6.9]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.155,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-07-25T22:00:16.656754+00:00", "updated": "2026-08-02T12:30:05.793015+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}