CVE catalog

CVE-2021-36084

libsepol: CVE-2021-36084

Severity: Low · CVSS 3.3CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Published: Jul 1, 2021, 3:15:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.46% · Oct 25, 2026

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).

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libsepol	sid	`3.11-1`	fixed
Debian	libsepol	forky	`3.11-1`	fixed
Debian	libsepol	trixie	`3.8.1-1`	fixed
Debian	libsepol	bookworm	`3.4-2.1`	fixed
Cpe	selinux	Not reported	Not reported	unknown
Cpe	fedora	Not reported	Not reported	unknown
Ubuntu	libsepol	pro	`2.3-2`	vulnerable
Ubuntu	libsepol	pro	`2.4-2`	vulnerable
Ubuntu	libsepol	pro	`2.4-2ubuntu0.1~esm1`	fixed
Ubuntu	libsepol	18.04	`2.7-1`	vulnerable
Ubuntu	libsepol	18.04	`2.7-1ubuntu0.1`	fixed
Ubuntu	libsepol	20.04	`2.9-2`	vulnerable
Ubuntu	libsepol	20.04	`3.0-1`	vulnerable
Ubuntu	libsepol	20.04	`3.0-1ubuntu0.1`	fixed
Ubuntu	libsepol	pro	`2.3-2`	vulnerable
Ubuntu	libsepol	pro	`2.4-2`	vulnerable
Ubuntu	libsepol	pro	`2.4-2ubuntu0.1~esm1`	fixed
Ubuntu	libsepol	18.04	`2.7-1`	vulnerable
Ubuntu	libsepol	18.04	`2.7-1ubuntu0.1`	fixed
Ubuntu	libsepol	20.04	`2.9-2`	vulnerable
Ubuntu	libsepol	20.04	`3.0-1`	vulnerable
Ubuntu	libsepol	20.04	`3.0-1ubuntu0.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libsepol	source	sid	`3.3-1`	not yet assigned	Not reported	[990526]
Debian	libsepol	source	forky	`3.3-1`	not yet assigned	Not reported	[990526]
Debian	libsepol	source	trixie	`3.3-1`	not yet assigned	Not reported	[990526]
Debian	libsepol	source	bookworm	`3.3-1`	not yet assigned	Not reported	[990526]
Ubuntu	libsepol	deb	pro	`2.4-2ubuntu0.1~esm1`	Not reported	USN-5391-1	Not reported
Ubuntu	libsepol	deb	18.04	`2.7-1ubuntu0.1`	Not reported	USN-5391-1	Not reported
Ubuntu	libsepol	deb	20.04	`3.0-1ubuntu0.1`	Not reported	USN-5391-1	Not reported
Ubuntu	libsepol	deb	pro	`2.4-2ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2021-36084	Not reported
Ubuntu	libsepol	deb	18.04	`2.7-1ubuntu0.1`	Not reported	UBUNTU-CVE-2021-36084	Not reported
Ubuntu	libsepol	deb	20.04	`3.0-1ubuntu0.1`	Not reported	UBUNTU-CVE-2021-36084	Not reported

[Debian bug #990526]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libsepol2]Fixed
Source package: [libsepol]
Details (2)
- 3.4-2.1 · amd64 · bookworm
  Fixed · Fixed: 3.3-1
  dsa · libsepol · debian · bookworm
- 3.4-2.1 · arm64 · bookworm
  Fixed · Fixed: 3.3-1
  dsa · libsepol · debian · bookworm
[libsepol-dev]Fixed
Source package: [libsepol]
Details (2)
- 3.4-2.1 · amd64 · bookworm
  Fixed · Fixed: 3.3-1
  dsa · libsepol · debian · bookworm
- 3.4-2.1 · arm64 · bookworm
  Fixed · Fixed: 3.3-1
  dsa · libsepol · debian · bookworm
[sepol-utils]Fixed
Source package: [libsepol]
Details (2)
- 3.4-2.1 · amd64 · bookworm
  Fixed · Fixed: 3.3-1
  dsa · libsepol · debian · bookworm
- 3.4-2.1 · arm64 · bookworm
  Fixed · Fixed: 3.3-1
  dsa · libsepol · debian · bookworm

Observed: Oct 23, 2026, 5:58:42 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]