CVE-2026-64372

Kernel memory corruption via stale ACPI buffer

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel PCC cpufreq driver allows local users to corrupt kernel memory during ACPI _OSC negotiation. pcc_cpufreq_do_osc() frees the first result buffer but retains its pointer and nonzero length, so the second acpi_evaluate_object() call writes into freed memory before the cleanup path frees it again. Reachability requires an x86 system exposing the PCC ACPI objects; successful corruption permits kernel data modification or disclosure and can crash the kernel.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel PCC cpufreq driver allows local users to corrupt kernel memory during ACPI _OSC negotiation. pcc_cpufreq_do_osc() frees the first result buffer but retains its pointer and nonzero length, so the second acpi_evaluate_object() call writes into freed memory before the cleanup path frees it again. Reachability requires an x86 system exposing the PCC ACPI objects; successful corruption permits kernel data modification or disclosure and can crash the kernel.

The record

CVE
CVE-2026-64372
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29
  2. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <266d3dd8b757b48a576e90f018b51f7b7563cc32
  3. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <5cdb25f144b101083d8bf3fd023ad87fbe6850d7
  4. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <632666a63116d8061c62a988d1ca39dcd6d27c9b
  5. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7
  6. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <8e454e9d0bc03446d610ee49abec9dfd424f6541
  7. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <982c9f92d57bda2b769851ff6d90d43dcf5f3734
  8. Affected versionversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <a36ca93a8ba57464e521d70a337d37f069064111
  9. Affected versionversion=2.6.34

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0f1d683fb35d6c6f49ef696c95757f3970682a0e <0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <266d3dd8b757b48a576e90f018b51f7b7563cc32; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <5cdb25f144b101083d8bf3fd023ad87fbe6850d7; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <632666a63116d8061c62a988d1ca39dcd6d27c9b; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <8e454e9d0bc03446d610ee49abec9dfd424f6541; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <982c9f92d57bda2b769851ff6d90d43dcf5f3734; version=0f1d683fb35d6c6f49ef696c95757f3970682a0e <a36ca93a8ba57464e521d70a337d37f069064111; version=2.6.34

Published CVSS scores

7.8Linux kernel.org CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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