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CVE-2021-36084

Publication date 1 July 2021

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

3.3 · Low

Score breakdown

The CIL compiler in SELinux 3.2 has a use-after-free in __cil_verify_classperms (called from __cil_verify_classpermission and __cil_pre_verify_helper).

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
14.04 LTS trusty
Not affected

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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

Parameter Value
Base score 3.3 · Low
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

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

Other references