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🛡️ ALSA-2021:4586 — gcc-toolset-11-gcc (CVE-2021-42574)

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Moderate: gcc-toolset-11-gcc security update

The gcc packages provide compilers for C, C++, Java, Fortran, Objective C, and Ada 95 GNU, as well as related support libraries.

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 gcc in order to facilitate detection of BiDi Unicode characters:

This update implements a new warning option -Wbidirectional to warn about possibly dangerous bidirectional characters.

There are three levels of warning supported by gcc:

"-Wbidirectional=unpaired", which warns about improperly terminated BiDi contexts. (This is the default.)

"-Wbidirectional=none", which turns the warning off.

"-Wbidirectional=any", which warns about any use of bidirectional characters.

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.

Affected software

ALSA-2021:4586 is recorded against 18 packages.

  • gcc-toolset-11-gcc (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-gcc-c++ (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-gcc-gdb-plugin (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-gcc-gfortran (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-gcc-plugin-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libasan-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libatomic-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libgccjit (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libgccjit-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libgccjit-docs (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libitm-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-liblsan-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libquadmath-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libstdc++-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libstdc++-docs (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libtsan-devel (fixed in 11.2.1-1.2.el8_5)
  • gcc-toolset-11-libubsan-devel (fixed in 11.2.1-1.2.el8_5)
  • libasan6 (fixed in 11.2.1-1.2.el8_5)

Timeline and source

Published on 10 November 2021 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

vulners.com (Report)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2021-11-10
Updated 2026-08-20
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
gcc-toolset-11-gcc — 11.2.1-1.2.el8_5
gcc-toolset-11-gcc-c++ — 11.2.1-1.2.el8_5
gcc-toolset-11-gcc-gdb-plugin — 11.2.1-1.2.el8_5
gcc-toolset-11-gcc-gfortran — 11.2.1-1.2.el8_5
gcc-toolset-11-gcc-plugin-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libasan-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libatomic-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libgccjit — 11.2.1-1.2.el8_5
gcc-toolset-11-libgccjit-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libgccjit-docs — 11.2.1-1.2.el8_5
gcc-toolset-11-libitm-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-liblsan-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libquadmath-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libstdc++-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libstdc++-docs — 11.2.1-1.2.el8_5
gcc-toolset-11-libtsan-devel — 11.2.1-1.2.el8_5
gcc-toolset-11-libubsan-devel — 11.2.1-1.2.el8_5
libasan6 — 11.2.1-1.2.el8_5

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