HOMEVULNERABILITIESCVE-2021-36084
LOW

CVE-2021-36084

CWE-416Published: July 1, 2021· Updated: Jun 17, 2026

3.3
CVSS v3.1

Official Description

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).

NVD Source

Technical Analysis

CVE-2021-36084 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected Vendors & Products

Fedora1 product(s)
fedora
selinux_project1 product(s)
selinux
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31065
PATCHhttps://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3
PATCHhttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31065
PATCHhttps://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3
ADVISORYhttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-417.yaml
ADVISORYhttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-417.yaml

All References (10)

→
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31065Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3Patch · Third Party Advisory
→
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-417.yamlThird Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/
→
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31065Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3Patch · Third Party Advisory
→
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-417.yamlThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2024/10/msg00021.html
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/
→
https://security.netapp.com/advisory/ntap-20250207-0004/

Quick Facts

CVE IDCVE-2021-36084
CVSS Score3.3 / 10
SeverityLOW
WeaknessCWE-416
CISA KEVNo
Affected2 vendor(s)
PublishedJul 1, 2021

Related CVEs (CWE-416)

CVE-2012-5139
10.0
CVE-2012-5137
10.0
CVE-2012-3963
10.0
CVE-2011-0982
10.0
CVE-2012-3968
10.0
CVE-2012-5140
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-36084 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-36084·NVD