Vulnerability · CVE-2021-36084
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).
Published Jul 1, 2021 · catalog updated Oct 14, 2026 · selinux project
Check if you run it
No confirmed exploitation is on record for CVE-2021-36084. EPSS is 0.46%. Act only if a listed version of selinux project is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Low3.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.46%
- Remediation
- Advisory link
- Affected products
- cpe fedoraproject/fedora · cpe selinux project/selinux
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).
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe fedoraproject/fedora35
- cpe selinux project/selinux3.2
How to fix CVE-2021-36084
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-36084. EPSS is 0.46%. Act only if a listed version of selinux project is installed.
Which versions are affected?
Compare what you have installed with selinux project/selinux 3.2. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-416: Use After Free. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Jul 1, 2021 · NIST NVD
Detected
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).
Oct 14, 2026 · NIST NVD
Updated
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).
Sources
- CVE.orgVulnerability recordCVE-2021-36084
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-36084
30-day exploitation probability 0.5%
first.org - NIST NVDVulnerability recordCVE-2021-36084
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.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.