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CVE-2021-36084

Published: 1 July 2021

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).

Notes

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

Priority

Low

Cvss 3 Severity Score

3.3

Score breakdown

Status

Package Release Status
libsepol
Launchpad, Ubuntu, Debian
jammy Not vulnerable
(3.3-1)
groovy Ignored
(end of life)
bionic
Released (2.7-1ubuntu0.1)
focal
Released (3.0-1ubuntu0.1)
trusty Not vulnerable
(code not present)
upstream
Released (3.3-1)
impish
Released (3.1-1ubuntu2.1)
hirsute Ignored
(end of life)
xenial
Released (2.4-2ubuntu0.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
Patches:
upstream: https://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3

Severity score breakdown

Parameter Value
Base score 3.3
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