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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-64512 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: CPPC: Suppress UBSAN warning caused by field misuse The definition of reg->access_width changes depending on the reg->space_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses access_width to indicate the PCC region, which can result in a UBSAN if the value is greater than 4. For example: UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9 shift exponent 32 is too large for 32-bit type 'int' CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy) Hardware name: To be filled by O.E.M. Call trace: ...(trimming) ubsan_epilogue+0x10/0x48 __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0 cpc_write+0x4d0/0x670 cppc_set_perf+0x18c/0x490 cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq] ... (trimming) Lets fix this by validating the region type, as well as whether access_width has a value. Then since we are returning bit_width directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting the size.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1 kernel.org
https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99 kernel.org
https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c kernel.org
https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2 kernel.org
https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9 kernel.org
https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2 kernel.org
https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-64512
NVD Published Date:
07/25/2026
NVD Last Modified:
07/25/2026
Source:
kernel.org