Linux Kernel cgroup v1 Parser cgroup-v1.c cgroup1_parse_param syscall use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been declared as critical. Affected by this vulnerability is the function cgroup1_parse_param of the file kernel/cgroup/cgroup-v1.c of the component cgroup v1 Parser. The manipulation of the argument syscall results in use after free. This vulnerability is cataloged as CVE-2021-4154. The attack may be launched remotely. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel (Operating System) (version now known). Affected is the function cgroup1_parse_param of the file kernel/cgroup/cgroup-v1.c of the component cgroup v1 Parser. The manipulation of the argument syscall with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability.

The weakness was shared 02/05/2022 as 2034514. The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2021-4154 since 12/22/2021. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 248388 (Linux Distros Unpatched Vulnerability : CVE-2021-4154), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the vulnerability database at Tenable (248388). Once again VulDB remains the best source for vulnerability data.

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 248388
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-4154

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

12/22/2021 🔍
02/05/2022 +45 days 🔍
02/05/2022 +0 days 🔍
08/12/2025 +1284 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 2034514
Status: Confirmed

CVE: CVE-2021-4154 (🔍)
GCVE (CVE): GCVE-0-2021-4154
GCVE (VulDB): GCVE-100-192324

Entryinfo

Created: 02/05/2022 08:10
Updated: 08/12/2025 12:34
Changes: 02/05/2022 08:10 (43), 02/07/2022 09:28 (1), 08/12/2025 12:34 (16)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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