Detections
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CVE-2021-36087

low

Description

The CIL compiler in SELinux 3.2 has a heap-based buffer over-read in ebitmap_match_any (called indirectly from cil_check_neverallow). This occurs because there is sometimes a lack of checks for invalid statements in an optional block.

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml

https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521

https://security.netapp.com/advisory/ntap-20250207-0004/

https://lore.kernel.org/selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ%40mail.gmail.com/T/

https://lists.debian.org/debian-lts-announce/2024/10/msg00021.html

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-22720

https://cert-portal.siemens.com/productcert/html/ssa-398330.html

https://cert-portal.siemens.com/productcert/html/ssa-202008.html

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675

Details

Source: Mitre, NVD

Published: 2021-07-01

Updated: 2026-10-14

Risk Information

CVSS v2

Base Score: 2.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P

Severity: Low

CVSS v3

Base Score: 3.3

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Severity: Low

EPSS

EPSS: 0.00479