ACPI: CPPC: Suppress UBSAN warning caused by field misuse
Summary
| CVE | CVE-2026-64512 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-25 10:17:37 UTC |
| Updated | 2026-07-25 10:17:37 UTC |
| 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. |
Risk And Classification
EPSS: 0.001730000 probability, percentile 0.069960000 (date 2026-07-29)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4949affd5288b867cdf115f5b08d6166b2027f87 b54c4632946ae42f2b39ed38abd909bbf78cbcc2 git | Not specified |
| CNA | Linux | Linux | affected 01fc53be672acae37e611c80cc0b4f3939584de3 e904596ba6dd108534ffa15e3e46b2fe245145e2 git | Not specified |
| CNA | Linux | Linux | affected 1b890ae474d19800a6be1696df7fb4d9a41676e4 2fb80e962029000959f651665baa4838cc92eb99 git | Not specified |
| CNA | Linux | Linux | affected 2f4a4d63a193be6fd530d180bb13c3592052904c 37f28bf8f14672dfa395994e41fd778a63f0bf5c git | Not specified |
| CNA | Linux | Linux | affected 2f4a4d63a193be6fd530d180bb13c3592052904c f29dc6132d4968e39d8fa575d1a12e2c718ce57b git | Not specified |
| CNA | Linux | Linux | affected 2f4a4d63a193be6fd530d180bb13c3592052904c dc066bd13c860bb27d6ace511210e18b8064c1d9 git | Not specified |
| CNA | Linux | Linux | affected 2f4a4d63a193be6fd530d180bb13c3592052904c 1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1 git | Not specified |
| CNA | Linux | Linux | affected 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1 git | Not specified |
| CNA | Linux | Linux | affected 5.15.154 5.15.155 semver | Not specified |
| CNA | Linux | Linux | affected 6.1.90 6.1.178 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.30 6.6.145 semver | Not specified |
| CNA | Linux | Linux | affected 6.8.9 6.9 semver | Not specified |
| CNA | Linux | Linux | affected 6.9 | Not specified |
| CNA | Linux | Linux | unaffected 6.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.155 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.96 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.39 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.4 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.