PT-2021-3582 · Selinux+6 · Selinux+6

Published 2021-03-18 · Updated 2025-11-03 · CVE-2021-36086

Positive Technologies (AI Summary)

CVSS v2.0

3.6

Low

Base vector

AV:L/AC:L/Au:N/C:P/I:N/A:P

Name of the Vulnerable Software and Affected Versions SELinux version 3.2

Description The issue is related to a use-after-free in the cil reset classpermission() function of the CIL compiler in SELinux. This function is called from cil reset classperms set and cil reset classperms list. The exploitation of this issue may allow an attacker to cause a denial of service.

Recommendations For SELinux version 3.2, at the moment, there is no information about a newer version that contains a fix for this vulnerability. As a temporary workaround, consider disabling the cil reset classpermission() function until a patch is available. Restrict access to the CIL compiler to minimize the risk of exploitation.

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALSA-2021:4513

BDU:2021-03684

CESA-2021_4513

CVE-2021-36086

DLA-3930-1

OESA-2022-1753

OPENSUSE-SU-2024:10990-1

RHSA-2021:4513

RHSA-2021_4513

RLSA-2021:4513

USN-5391-1

Affected Products

Almalinux

Centos

Linuxmint

Red Hat

Rocky Linux

Selinux

Ubuntu

References · 39

• 🔥 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32177 · Exploit
• https://github.com/SELinuxProject/selinux/commit/c49a8ea09501ad66e799ea41b8154b6770fec2c8 · Patch
• https://security-tracker.debian.org/tracker/CVE-2021-36086 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-36087 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-36086 · Vendor Advisory
• https://osv.dev/vulnerability/USN-5391-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-36086 · Security Note
• https://osv.dev/vulnerability/ALSA-2021:4513 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-4513.html · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2022-1753 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3930-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-36084 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2021:4513 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-36086 · Vendor Advisory