Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-64512

ACPI: CPPC: Suppress UBSAN warning caused by field misuse

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.155, 6.1.178, 6.6.145, 6.9
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5.15.154 · fixed in 5.15.155; From 6.1.90 · fixed in 6.1.178; From 6.6.30 · fixed in 6.6.145; From 6.8.9 · fixed in 6.9

  • Linux Linux

    6.9

References 7

git.kernel.org