medium
6.2
CWE
416
Advisory Published
Updated

CVE-2021-36084: Use After Free

First published: Thu Jul 01 2021(Updated: )

SELinux Project SELinux is vulnerable to a denial of service, caused by a use-after-free in __cil_verify_classperms. By sending a specially-crafted request, a local attacker could exploit this vulnerability to cause a denial of service condition.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
SELinux Project SELinux=3.2
Fedoraproject Fedora=35
IBM QRadar SIEM<=7.5.0 GA
IBM QRadar SIEM<=7.4.3 GA - 7.4.3 FP4
IBM QRadar SIEM<=7.3.3 GA - 7.3.3 FP10

Remedy

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31065

Remedy

https://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-36084?

    CVE-2021-36084 is a vulnerability in SELinux that allows a local attacker to cause a denial of service.

  • How does CVE-2021-36084 work?

    CVE-2021-36084 is caused by a use-after-free vulnerability in __cil_verify_classperms, which can be exploited by sending a specially-crafted request.

  • What is the severity of CVE-2021-36084?

    The severity of CVE-2021-36084 is medium, with a CVSS score of 6.2.

  • How can I fix CVE-2021-36084 in IBM QRadar SIEM 7.5.0 GA?

    To fix CVE-2021-36084 in IBM QRadar SIEM 7.5.0 GA, you can apply the patch available from IBM Support.

  • How can I fix CVE-2021-36084 in IBM QRadar SIEM 7.4.3 GA - 7.4.3 FP4?

    To fix CVE-2021-36084 in IBM QRadar SIEM 7.4.3 GA - 7.4.3 FP4, you can apply the patch available from IBM Support.

  • How can I fix CVE-2021-36084 in IBM QRadar SIEM 7.3.3 GA - 7.3.3 FP10?

    To fix CVE-2021-36084 in IBM QRadar SIEM 7.3.3 GA - 7.3.3 FP10, you can apply the patch available from IBM Support.

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