{"api_version":"1","generated_at":"2026-08-04T13:11:01+00:00","cve":"CVE-2026-64512","urls":{"html":"https://cve.report/CVE-2026-64512","api":"https://cve.report/api/cve/CVE-2026-64512.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64512","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64512"},"summary":{"title":"ACPI: CPPC: Suppress UBSAN warning caused by field misuse","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:37","updated_at":"2026-07-25 10:17:37"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99","name":"https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2","name":"https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1","name":"https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2","name":"https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9","name":"https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c","name":"https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b","name":"https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64512","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64512","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4949affd5288b867cdf115f5b08d6166b2027f87 b54c4632946ae42f2b39ed38abd909bbf78cbcc2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 01fc53be672acae37e611c80cc0b4f3939584de3 e904596ba6dd108534ffa15e3e46b2fe245145e2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1b890ae474d19800a6be1696df7fb4d9a41676e4 2fb80e962029000959f651665baa4838cc92eb99 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f4a4d63a193be6fd530d180bb13c3592052904c 37f28bf8f14672dfa395994e41fd778a63f0bf5c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f4a4d63a193be6fd530d180bb13c3592052904c f29dc6132d4968e39d8fa575d1a12e2c718ce57b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f4a4d63a193be6fd530d180bb13c3592052904c dc066bd13c860bb27d6ace511210e18b8064c1d9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f4a4d63a193be6fd530d180bb13c3592052904c 1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.154 5.15.155 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.90 6.1.178 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.30 6.6.145 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8.9 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.155 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64512","cve":"CVE-2026-64512","epss":"0.001730000","percentile":"0.069960000","score_date":"2026-07-29","updated_at":"2026-07-30 00:09:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/acpi/cppc_acpi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b54c4632946ae42f2b39ed38abd909bbf78cbcc2","status":"affected","version":"4949affd5288b867cdf115f5b08d6166b2027f87","versionType":"git"},{"lessThan":"e904596ba6dd108534ffa15e3e46b2fe245145e2","status":"affected","version":"01fc53be672acae37e611c80cc0b4f3939584de3","versionType":"git"},{"lessThan":"2fb80e962029000959f651665baa4838cc92eb99","status":"affected","version":"1b890ae474d19800a6be1696df7fb4d9a41676e4","versionType":"git"},{"lessThan":"37f28bf8f14672dfa395994e41fd778a63f0bf5c","status":"affected","version":"2f4a4d63a193be6fd530d180bb13c3592052904c","versionType":"git"},{"lessThan":"f29dc6132d4968e39d8fa575d1a12e2c718ce57b","status":"affected","version":"2f4a4d63a193be6fd530d180bb13c3592052904c","versionType":"git"},{"lessThan":"dc066bd13c860bb27d6ace511210e18b8064c1d9","status":"affected","version":"2f4a4d63a193be6fd530d180bb13c3592052904c","versionType":"git"},{"lessThan":"1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1","status":"affected","version":"2f4a4d63a193be6fd530d180bb13c3592052904c","versionType":"git"},{"status":"affected","version":"6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1","versionType":"git"},{"lessThan":"5.15.155","status":"affected","version":"5.15.154","versionType":"semver"},{"lessThan":"6.1.178","status":"affected","version":"6.1.90","versionType":"semver"},{"lessThan":"6.6.145","status":"affected","version":"6.6.30","versionType":"semver"},{"lessThan":"6.9","status":"affected","version":"6.8.9","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/acpi/cppc_acpi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.155","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.155","versionStartIncluding":"5.15.154","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"6.1.90","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:52:04.423Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"},{"url":"https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b"},{"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","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64512","datePublished":"2026-07-25T08:52:04.423Z","dateReserved":"2026-07-19T15:36:31.793Z","dateUpdated":"2026-07-25T08:52:04.423Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:37","lastModifiedDate":"2026-07-25 10:17:37","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64512","Ordinal":"1","Title":"ACPI: CPPC: Suppress UBSAN warning caused by field misuse","CVE":"CVE-2026-64512","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64512","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ACPI: CPPC: Suppress UBSAN warning caused by field misuse"}]}}}