Skip to content
OpenAdvisories
Medium RLSA-2021:4743 1 CVE

Moderate: llvm-toolset:rhel8 security update

Published Nov 18, 2021 · Updated Feb 4, 2026

Summary

LLVM Toolset provides the LLVM compiler infrastructure framework, the Clang compiler for the C and C++ languages, the LLDB debugger, and related tools for code analysis.

Security Fix(es):

* Developer environment: Unicode's bidirectional (BiDi) override characters can cause trojan source attacks (CVE-2021-42574)

The following changes were introduced in clang in order to facilitate detection of BiDi Unicode characters:

clang-tidy now finds identifiers that contain Unicode characters with right-to-left direction, which can be confusing as they may change the understanding of a whole statement.

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 8

ReleasePackageFixed in
Rocky Linux · 8 clang 0:12.0.1-4.module+el8.5.0+715+58f51d49
Rocky Linux · 8 compiler-rt 0:12.0.1-1.module+el8.5.0+692+8756646f
Rocky Linux · 8 libomp 0:12.0.1-1.module+el8.5.0+692+8756646f
Rocky Linux · 8 lld 0:12.0.1-1.module+el8.5.0+692+8756646f
Rocky Linux · 8 lldb 0:12.0.1-1.module+el8.5.0+692+8756646f
Rocky Linux · 8 llvm 0:12.0.1-2.module+el8.5.0+692+8756646f
Rocky Linux · 8 llvm-toolset 0:12.0.1-1.module+el8.5.0+692+8756646f
Rocky Linux · 8 python-lit 0:12.0.1-1.module+el8.5.0+692+8756646f

Vulnerabilities 1

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2005819