{"cve":"CVE-2026-64512","nvd":{"published":"2026-07-25T10:17:37.380","modified":"2026-08-17T05:17:57.400","status":"Received","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1","https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99","https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c","https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2","https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64512","score":0.00173,"percentile":0.06737,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}