Security Vulnerabilities fixed in glibc RHSA-2021:4358

Description

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly. Security Fix(es): glibc: Arbitrary read in wordexp() (CVE-2021-35942) glibc: Use-after-free in addgetnetgrentX function in netgroupcache.c (CVE-2021-27645) glibc: mq_notify does not handle separately allocated thread attributes (CVE-2021-33574) glibc: Arbitrary read in wordexp() (CVE-2021-35942) glibc: Use-after-free in addgetnetgrentX function in netgroupcache.c (CVE-2021-27645) glibc: mq_notify does not handle separately allocated thread attributes (CVE-2021-33574) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section. SolutionFor details on how to apply this update, which includes the changes described in this advisory, refer to:https://access.redhat.com/articles/11258 For the update to take effect, all services linked to the glibc library must be restarted, or the system rebooted.

Affected Applications

glibc

CVE References

CVE-2021-33574 CVE-2021-27645 CVE-2021-35942

Other References

https://access.redhat.com/errata/RHSA-2021:4358