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CVE-2021-36084

16
FAUCET Score

CVE-2021-36084 describes a use-after-free vulnerability within the CIL compiler of SELinux 3.2, impacting Fedora and SELinux Project distributions. This vulnerability has a low severity CVSS score of 3.3, indicating a local attack vector with low complexity, requiring user interaction, and primarily leading to a low impact on availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.2CPE matchmatch criteria
cpe:2.3:o:selinux_project:selinux:3.2:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.3LOW

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.48%
Probability of exploitation in next 30 days
EPSS Percentile
38.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0048 is in the 50th percentile among its peer group of 577 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libsepol-0:2.9-3.el8
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libsepol

Vendor Advisories (1)

redhatCVE-2021-36084Moderate

libsepol: use-after-free in __cil_verify_classperms()

Apr 19, 2021

References

lists.debian.org / debian-lts-announce/2024/10/msg00021.html
security.netapp.com / advisory/ntap-20250207-0004
bugs.chromium.org / p/oss-fuzz/issues/detail
ExploitIssue TrackingPatchThird Party Advisory
github.com / google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-417.yaml
Third Party Advisory
github.com / SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3
PatchThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR