NVD / CVE Program· CNA Linux

CVE-2021-47313: cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init

Noroxi assessment

Priority: Monitor (action score 33/100)

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: 0.25% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux b775383355755885b19d2acef977f1ca132e80a3, e1b2b2b61d30d7ce057ec17237c217d152ed97f2, fe2535a44904a77615a3af8e8fd7dafb98fb0e1b.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux b775383355755885b19d2acef977f1ca132e80a3, e1b2b2b61d30d7ce057ec17237c217d152ed97f2, fe2535a44904a77615a3af8e8fd7dafb98fb0e1b 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: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init It's a classic example of memleak, we allocate something, we fail and never free the resources. Make sure we free all resources on policy ->init() failures.

HighCVSS 8.4 · v3.1—No exploit Fix available

Denial of service

Published: May 21, 2024
Updated: Jun 17, 2026
EPSS: 0.2% · 17th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 33 / 40 · 8.4 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

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

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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 kernel5.11 and later · before 5.12.19
linux linux kernel5.13 and later · before 5.13.4

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
- 5.11affected
- a28b2bfc099c6b9caa6ef697660408e076a32019 and later · before b775383355755885b19d2acef977f1ca132e80a3affected · git
- a28b2bfc099c6b9caa6ef697660408e076a32019 and later · before e1b2b2b61d30d7ce057ec17237c217d152ed97f2affected · git
- a28b2bfc099c6b9caa6ef697660408e076a32019 and later · before fe2535a44904a77615a3af8e8fd7dafb98fb0e1baffected · git
- before 5.11not affected · semver
- 5.12.19 and later · up to and including 5.12.*not affected · semver
- 5.13.4 and later · up to and including 5.13.*not affected · semver
- 5.14 and laternot affected · original_commit_for_fix

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Red Hat:enterprise_linux:8::baseos	bpftool	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	bpftool-debuginfo	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-abi-stablelists	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-core	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debug	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debug-core	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debug-debuginfo	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debug-devel	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debug-modules	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debug-modules-extra	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-aarch64	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-ppc64le	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-s390x	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-x86_64	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-devel	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-doc	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-modules	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-modules-extra	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-tools	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-tools-debuginfo	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-tools-libs	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseos	kernel-zfcpdump	before 0:4.18.0-425.3.1.el8	0:4.18.0-425.3.1.el8

+10

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
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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
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CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2021-47311May 21, 2024 · net: qcom/emac: fix UAF in emac_remove
31Monitor
← EarlierCVE-2021-47312May 21, 2024 · netfilter: nf_tables: Fix dereference of null pointer flow
22Monitor
Later →CVE-2021-47314May 21, 2024 · memory: fsl_ifc: fix leak of private memory on probe failure
22Monitor

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	b775383355755885b19d2acef977f1ca132e80a3	Vendor (CNA)
Linux Linux	e1b2b2b61d30d7ce057ec17237c217d152ed97f2	Vendor (CNA)
Linux Linux	fe2535a44904a77615a3af8e8fd7dafb98fb0e1b	Vendor (CNA)
red hat:bpftool	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:bpftool-debuginfo	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-abi-stablelists	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-core	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-core	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-devel	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-modules	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-modules-extra	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debuginfo	0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseos	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.

CVE-2024-3946235 days apartclk: bcm: dvp: Assign ->num before accessing ->hws
39Monitor
CVE-2021-444035 days apartx86/xen: Drop USERGS_SYSRET64 paravirt call
35Monitor
CVE-2024-3861629 days apartwifi: carl9170: re-fix fortified-memset warning
32Monitor
CVE-2021-4702383 days apartnet: marvell: prestera: fix port event handling on init
32Monitor
CVE-2024-359481 days apartbcachefs: Check for journal entries overruning end of sb clean section
31Monitor
CVE-2024-2697620 days apartKVM: Always flush async #PF workqueue when vCPU is being destroyed
31Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-0519 · May 22, 2024(Linux Kernel Güncellemesi)

All national notices →

Technical details

Attack conditions

Someone with local access to the system can trigger it.
No account or password is required.
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: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

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

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

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

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/b775383355755885b19d2acef977f1ca132e80a3

Show all references (2 more)

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

All records