CVE-2026-64372 - Vulnerability Details

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

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.

Published: 2026-07-25

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 8e454e9d0bc03446d610ee49abec9dfd424f6541
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 632666a63116d8061c62a988d1ca39dcd6d27c9b
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 5cdb25f144b101083d8bf3fd023ad87fbe6850d7
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 982c9f92d57bda2b769851ff6d90d43dcf5f3734
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< a36ca93a8ba57464e521d70a337d37f069064111
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29
`0f1d683fb35d6c6f49ef696c95757f3970682a0e`	affected	< 266d3dd8b757b48a576e90f018b51f7b7563cc32

Linux

affected

Version	Status	Constraints
`2.6.34`	affected	—
`0`	unaffected	< 2.6.34
`5.10.261`	unaffected	≤ 5.10.*
`5.15.212`	unaffected	≤ 5.15.*
`6.1.178`	unaffected	≤ 6.1.*
`6.6.145`	unaffected	≤ 6.6.*
`6.12.96`	unaffected	≤ 6.12.*
`6.18.39`	unaffected	≤ 6.18.*
`7.1.4`	unaffected	≤ 7.1.*
`7.2-rc1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,8e454e9d0bc03446d610ee49abec9dfd424f6541)`	affected	code_commit	—
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,632666a63116d8061c62a988d1ca39dcd6d27c9b)`	affected	code_commit	—
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,5cdb25f144b101083d8bf3fd023ad87fbe6850d7)`	affected	code_commit	—
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,982c9f92d57bda2b769851ff6d90d43dcf5f3734)`	affected	code_commit	—
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7)`	affected	code_commit	—
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29)`	affected	code_commit	—
`[0f1d683fb35d6c6f49ef696c95757f3970682a0e,266d3dd8b757b48a576e90f018b51f7b7563cc32)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.34`	affected	semver	—
`[0,2.6.34)`	unaffected	semver	—
`[5.10.261,5.11.0)`	unaffected	semver	—
`[5.15.212,5.16.0)`	unaffected	semver	—
`[6.1.178,6.2.0)`	unaffected	semver	—
`[6.6.145,6.7.0)`	unaffected	semver	—
`[6.12.96,6.13.0)`	unaffected	semver	—
`[6.18.39,6.19.0)`	unaffected	semver	—
`[7.1.4,7.2.0)`	unaffected	semver	—
`[7.2-rc1,*]`	unaffected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00126.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29
https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32
https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7
https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b
https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7
https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541
https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734
https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111
https://lore.kernel.org/linux-cve-announce/2026072523-CVE-2026-64372-794b@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-64372
https://www.cve.org/CVERecord?id=CVE-2026-64372

History

Wed, 29 Jul 2026 12:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-763
References		https://lore.kernel.org/linux-cve-announce/2026072523-CVE-2026-64372-794b@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-64372 https://www.cve.org/CVERecord?id=CVE-2026-64372
Metrics	threat_severity `None`	threat_severity `Moderate`

Tue, 28 Jul 2026 16:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416 CWE-590

Mon, 27 Jul 2026 05:15:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Sat, 25 Jul 2026 09:30:00 +0000

Type	Values Removed	Values Added
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.
Title		cpufreq: pcc: fix use-after-free and double free in _OSC evaluation
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32 https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7 https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541 https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734 https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-25T08:50:24.733Z

Updated: 2026-07-27T05:00:01.364Z

Reserved: 2026-07-19T15:36:31.783Z

Link: CVE-2026-64372

Vulnrichment

No data.

NVD

No data.

Redhat

Severity : Moderate

Publid Date: 2026-07-25T00:00:00Z

Links: CVE-2026-64372 - Bugzilla

OpenCVE Enrichment

Updated: 2026-07-28T16:00:05Z

Weaknesses

CWE-416
Use After Free
CWE-590
Free of Memory not on the Heap
CWE-763
Release of Invalid Pointer or Reference

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object