#VU62662 Use-after-free in selinux - CVE-2021-36086

Vulnerability identifier: #VU62662

Vulnerability risk: Low

CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2021-36086

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerable software:
selinux

Software vendor:
SELinux Project

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the cil_reset_classpermission() function in CIL compiler in SELinux. A local user can perform a denial of service (DoS) attack.

Install updates from vendor's website.

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32177
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-536.yaml
• https://github.com/SELinuxProject/selinux/commit/c49a8ea09501ad66e799ea41b8154b6770fec2c8
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/