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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64372
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:20 UTC
Updated2026-07-27 05:16:43 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001260000 probability, percentile 0.026330000 (date 2026-07-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 8e454e9d0bc03446d610ee49abec9dfd424f6541 git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 632666a63116d8061c62a988d1ca39dcd6d27c9b git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 5cdb25f144b101083d8bf3fd023ad87fbe6850d7 git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 982c9f92d57bda2b769851ff6d90d43dcf5f3734 git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e a36ca93a8ba57464e521d70a337d37f069064111 git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 git Not specified
CNA Linux Linux affected 0f1d683fb35d6c6f49ef696c95757f3970682a0e 266d3dd8b757b48a576e90f018b51f7b7563cc32 git Not specified
CNA Linux Linux affected 2.6.34 Not specified
CNA Linux Linux unaffected 2.6.34 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 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

ReferenceSourceLinkTags
git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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