Not yet scoredPublished Jul 25, 2026

CVE-2026-64512ACPI: CPPC: Suppress UBSAN warning caused by field misuse

Updated under an hour ago (Oct 27, 2026, 3:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4949affd5288b867cdf115f5b08d6166b2027f87 before b54c4632946ae42f2b39ed38abd909bbf78cbcc2; from 01fc53be672acae37e611c80cc0b4f3939584de3 before e904596ba6dd108534ffa15e3e46b2fe245145e2; from 1b890ae474d19800a6be1696df7fb4d9a41676e4 before 2fb80e962029000959f651665baa4838cc92eb99; from 2f4a4d63a193be6fd530d180bb13c3592052904c before 37f28bf8f14672dfa395994e41fd778a63f0bf5c; from 2f4a4d63a193be6fd530d180bb13c3592052904c before f29dc6132d4968e39d8fa575d1a12e2c718ce57b; from 2f4a4d63a193be6fd530d180bb13c3592052904c before dc066bd13c860bb27d6ace511210e18b8064c1d9; 2f4a4d63a193be6fd530d180bb13c3592052904c builds before 1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1; 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1; and 4 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2
https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2
https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99
https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c
https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b
https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9
https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.