CVE-2026-64372

cpufreq: pcc: fix use-after-free and double free in _OSC evaluation

State: Published
Severity: 7.8 High
Published: Jul 25, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: pcc: fix use-after-free and double free in _OSC evaluation

pcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the two-phase _OSC negotiation. Between the two calls it freed output.pointer but left output.length unchanged. Since acpi_evaluate_object() treats a non-zero length with a non-NULL pointer as an existing buffer to write into, the second call wrote into freed memory (use-after-free). The subsequent kfree(output.pointer) at out_free then freed the same pointer a second time (double free).

Reset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER after freeing the first result, so ACPICA allocates a fresh buffer for each phase independently.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 8e454e9d0bc03446d610ee49abec9dfd424f6541Affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 632666a63116d8061c62a988d1ca39dcd6d27c9bAffected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 5cdb25f144b101083d8bf3fd023ad87fbe6850d7Affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 982c9f92d57bda2b769851ff6d90d43dcf5f3734Affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before a36ca93a8ba57464e521d70a337d37f069064111Affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7Affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29Affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 266d3dd8b757b48a576e90f018b51f7b7563cc32Affected
LinuxLinux	2.6.34Affected before 2.6.34Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.96 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 8e454e9d0bc03446d610ee49abec9dfd424f6541Affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 632666a63116d8061c62a988d1ca39dcd6d27c9bAffected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 5cdb25f144b101083d8bf3fd023ad87fbe6850d7Affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 982c9f92d57bda2b769851ff6d90d43dcf5f3734Affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before a36ca93a8ba57464e521d70a337d37f069064111Affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7Affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29Affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e to before 266d3dd8b757b48a576e90f018b51f7b7563cc32Affected

LinuxLinux

2.6.34Affected
before 2.6.34Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.96 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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