PT-2026-64733 · Linux · Linux

CVE-2026-64512 · Publicado 2026-07-25 · Atualizado 2026-07-25

Mitre

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.

Identificadores relacionados

CVE-2026-64512

Produtos afetados

Linux

Referências · 8

• https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2 · Nota
• https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b · Nota
• https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-64512 · Nota de Segurança
• https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c · Nota
• https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1 · Nota
• https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99 · Nota
• https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2 · Nota