The CIL compiler in SELinux 3.2 has a use-after-free in __cil_verify_classperms (called…
Priority LOW 16CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 2 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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).
Why it matters now
EPSS 0.00456 39th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 2 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:selinux_project:selinux:3.2:*:*:*:*:*:*:* | 3.2 | Vulnerable | SELinux Project |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
- cpe:2.3:o:selinux_project:selinux:3.2:*:*:*:*:*:*:* Versions 3.2 Vulnerable ·SELinux Project
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
Remediation
Red Hat 1 advisory
- RHSA-2021:4513 Released 2021-11-09 · Red Hat rating Moderatelibsepol security update
- Red Hat CodeReady Linux Builder (v. 8) libsepol-static-2.9-3.el8
- Red Hat Enterprise Linux BaseOS (v. 8) libsepol-2.9-3.el8, libsepol-devel-2.9-3.el8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2021:4513 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2021:4513 |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36084
- 2026-10-03 Alias added: GHSA-8p9r-xrm6-68wq
References
Sources
- CVE-2021-36084 · CVE Program
- CVE-2021-36084 · NVD
- FIRST EPSS
- GHSA-8p9r-xrm6-68wq · GitHub Advisory Database · CC BY 4.0
- CVE-2021-36084 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences