CVE-2021-36086

Publication date 1 July 2021

Last updated 25 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

3.3 · Low

Score breakdown

Description

The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).

Read the notes from the security team

Status

Package Ubuntu Release Status
libsepol 22.04 LTS jammy
Not affected
21.10 impish
Fixed 3.1-1ubuntu2.1
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Fixed 3.0-1ubuntu0.1
18.04 LTS bionic
Fixed 2.7-1ubuntu0.1
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

sbeattie

AppArmor is the default LSM in Ubuntu, issue only affects compilation of selinux policy trusty version predates the introduction of CIL

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libsepol

Severity score breakdown

CVSS version: CVSS v3.0

Base score 3.3 · Low

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

References

Related Ubuntu Security Notices (USN)

    • USN-5391-1
    • libsepol vulnerabilities
    • 27 April 2022

Other references

Access our resources on patching vulnerabilities