CVE-2026-64372· NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29, 266d3dd8b757b48a576e90f018b51f7b7563cc32, 5cdb25f144b101083d8bf3fd023ad87fbe6850d7; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.

Low priority for now. Upgrade to Linux Linux 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29, 266d3dd8b757b48a576e90f018b51f7b7563cc32, 5cdb25f144b101083d8bf3fd023ad87fbe6850d7; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Jul 25, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel2.6.34 and later · before 5.10.261
linux linux kernel5.11 and later · before 5.15.212
linux linux kernel5.16 and later · before 6.1.178
linux linux kernel6.2 and later · before 6.6.145
linux linux kernel6.7 and later · before 6.12.96
linux linux kernel6.13 and later · before 6.18.39
linux linux kernel6.19 and later · before 7.1.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 2.6.34affected
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 8e454e9d0bc03446d610ee49abec9dfd424f6541affected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 632666a63116d8061c62a988d1ca39dcd6d27c9baffected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 5cdb25f144b101083d8bf3fd023ad87fbe6850d7affected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 982c9f92d57bda2b769851ff6d90d43dcf5f3734affected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before a36ca93a8ba57464e521d70a337d37f069064111affected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7affected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29affected · git
- 0f1d683fb35d6c6f49ef696c95757f3970682a0e and later · before 266d3dd8b757b48a576e90f018b51f7b7563cc32affected · git
- before 2.6.34not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.180-1	6.1.180-1
Debian:12	linux-6.12	before 6.12.100-1~deb12u1	6.12.100-1~deb12u1
Debian:13	linux	before 6.12.96-1	6.12.96-1
Debian:14	linux	before 7.1.4-1	7.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now
CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
83Now

Published before and after this one in the same product

← EarlierCVE-2026-64370Jul 25, 2026 · posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path
22Monitor
← EarlierCVE-2026-64371Jul 25, 2026 · proc: protect ptrace_may_access() with exec_update_lock (part 1)
22Monitor
Later →CVE-2026-64374Jul 25, 2026 · sched/rt: Have RT_PUSH_IPI be default off for non PREEMPT_RT
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29	Vendor (CNA)
Linux Linux	266d3dd8b757b48a576e90f018b51f7b7563cc32	Vendor (CNA)
Linux Linux	5cdb25f144b101083d8bf3fd023ad87fbe6850d7	Vendor (CNA)
Linux Linux	632666a63116d8061c62a988d1ca39dcd6d27c9b	Vendor (CNA)
Linux Linux	6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7	Vendor (CNA)
Linux Linux	8e454e9d0bc03446d610ee49abec9dfd424f6541	Vendor (CNA)
Linux Linux	982c9f92d57bda2b769851ff6d90d43dcf5f3734	Vendor (CNA)
Linux Linux	a36ca93a8ba57464e521d70a337d37f069064111	Vendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.0	6.6.145.2-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.180-1 · Debian:12	Package registry (OSV)
debian:linux-6.12	6.12.100-1~deb12u1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records