SELinux 3.2 CIL Compiler __cil_verify_classperms use after free

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability was found in SELinux 3.2. It has been declared as critical. Affected by this vulnerability is the function __cil_verify_classperms of the component CIL Compiler. Such manipulation leads to use after free. This vulnerability is listed as CVE-2021-36085. There is no available exploit. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in SELinux 3.2. It has been rated as critical. Affected by this issue is the function __cil_verify_classperms of the component CIL Compiler. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability.

The weakness was presented 07/01/2021. The advisory is shared for download at bugs.chromium.org. This vulnerability is handled as CVE-2021-36085. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 209513 (Debian dla-3930 : libsepol1 - security update), 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 github.com.

The vulnerability is also documented in the vulnerability database at Tenable (209513). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 209513
Nessus Name: Debian dla-3930 : libsepol1 - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

07/01/2021 🔍
07/01/2021 +0 days 🔍
07/01/2021 +0 days 🔍
11/04/2025 +1587 days 🔍

Sourcesinfo

Advisory: bugs.chromium.org
Status: Confirmed

CVE: CVE-2021-36085 (🔍)
GCVE (CVE): GCVE-0-2021-36085
GCVE (VulDB): GCVE-100-177848
scip Labs: https://www.scip.ch/en/?labs.20140109

Entryinfo

Created: 07/01/2021 07:40
Updated: 11/04/2025 05:42
Changes: 07/01/2021 07:40 (38), 07/04/2021 16:26 (5), 10/22/2024 15:04 (16), 11/04/2025 05:42 (19)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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