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Vulnerabilities

Vulnerability · CVE-2021-36086

The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).

Published Jul 1, 2021 · catalog updated Oct 14, 2026 · debian linux

Check if you run it

No confirmed exploitation is on record for CVE-2021-36086. EPSS is 0.60%. Act only if a listed version of debian linux 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
0.60%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe fedoraproject/fedora · cpe netapp/active iq unified manager · cpe netapp/bootstrap os · cpe netapp/h610c firmware · cpe netapp/h610s firmware

The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).

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 debian/debian linux11.0
  • cpe fedoraproject/fedora35
  • cpe netapp/active iq unified managerversion unspecified
  • cpe netapp/bootstrap osversion unspecified
  • cpe netapp/h610c firmwareversion unspecified
  • cpe netapp/h610s firmwareversion unspecified
  • cpe netapp/h615c firmwareversion unspecified
  • cpe selinux project/selinuxversion unspecified

How to fix CVE-2021-36086

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-2021-36086. EPSS is 0.60%. Act only if a listed version of debian linux is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 11.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 0.60%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 1, 2021 · NIST NVD

    Detected

    The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).

  2. Oct 14, 2026 · NIST NVD

    Updated

    The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).

Sources

  • CVE.orgVulnerability recordCVE-2021-36086

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-36086

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2021-36086

    The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).

    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.