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CVE Record

CVE-2021-36084: The CIL compiler in SELinux 3.2 has a use-after-free in __cil_verify_classperms (called from __cil_verify_c...

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).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE is a memory-safety flaw in the SELinux CIL compiler. It affects policy compilation tooling rather than a typical internet-facing service. Business urgency depends on whether your Linux or appliance estate ships the affected SELinux 3.2 code and whether policy inputs are handled from less-trusted sources.

Executive priority

Treat this as a targeted patch-management item, not an emergency based on current evidence. Prioritize environments that compile SELinux policy, run affected distribution packages, or depend on vendors that reference this CVE.

Technical view

The issue is a use-after-free in SELinux 3.2, in __cil_verify_classperms, reachable through __cil_verify_classpermission and __cil_pre_verify_helper. The bundle cites OSS-Fuzz, an upstream SELinux commit, and Fedora, Debian LTS, and NetApp advisories. No CVSS, CWE, or detailed impact rating is provided.

Likely exposure

Likely exposure is systems or products packaging SELinux 3.2 CIL compiler components, including Linux distribution packages referenced by Fedora and Debian LTS advisories. The bundle does not provide affected version ranges beyond SELinux 3.2 or product-specific NetApp details.

Exploitation context

The source bundle supports a fuzz-discovered memory corruption issue and an upstream fix reference. It does not cite active exploitation, and KEV is false. No public exploit status or attacker prerequisites are established in the provided evidence.

Researcher notes

Evidence is incomplete for scoring and impact. Focus analysis on the upstream commit, OSS-Fuzz report, and downstream advisories. Do not assume remote exploitability, privilege impact, or affected products beyond the cited SELinux 3.2 and vendor advisory context.

Mitigation direction

  • Inventory systems and products that include SELinux CIL compiler components.
  • Apply applicable updates from SELinux upstream, Fedora, Debian LTS, or product vendors.
  • Review NetApp guidance if NetApp products are present in the environment.
  • Limit CIL policy compilation to trusted workflows while vendor status is confirmed.

Validation and detection

  • Check installed SELinux package versions against relevant vendor advisories.
  • Confirm the upstream fix commit is present in maintained source builds.
  • Verify Fedora or Debian LTS package updates are installed where applicable.
  • Document any NetApp advisory applicability or vendor non-applicability finding.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-36084 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.