What is CVE-2026-64512?

CVE-2026-64512 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.15.154 onward and patched in 5.15.155, 6.1.178, 6.6.145 and others. CVE-2026-64512 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64512?

CVE-2026-64512 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-64512?

Yes, CVE-2026-64512 has been patched. Fixed versions include 5.15.155, 6.1.178, 6.6.145 and others. If you are running Linux kernel 5.15.154 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64512 actively exploited?

CVE-2026-64512 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64512

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.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-07-25

Patch available

Yes

Affected versions

Linux kernel versions 5.15.154, 6.1.90, 6.6.30, 6.8.9, 6.9 and later are affected. Fixed in 5.15.155, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2-rc1 and their respective stable series.

Affected from

≥ 5.15.154 ≥ 6.1.90 ≥ 6.6.30 ≥ 6.8.9 ≥ 6.9

Fixed in

✓ 5.15.155 5.15.x ✓ 6.1.178 6.1.x ✓ 6.6.145 6.6.x ✓ 6.12.96 6.12.x ✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2-rc1

References

7 total

Showing 5 of 7 references View all on NVD

Frequently asked questions

What is CVE-2026-64512?

CVE-2026-64512 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15.154 onward and has been patched in 5.15.155, 6.1.178, 6.6.145 and others. CVE-2026-64512 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-64512?

Yes. CVE-2026-64512 has been patched. Fixed versions include 5.15.155, 6.1.178, 6.6.145 and others. If you are running Linux kernel 5.15.154 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64512 actively exploited?

No. CVE-2026-64512 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.