A glibc security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: glibc-2.32-6.fc33

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Fedora Update Notification
FEDORA-2021-2ba993d6c5
2021-05-22 01:07:28.002865
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Name : glibc
Product : Fedora 33
Version : 2.32
Release : 6.fc33
URL :   http://www.gnu.org/software/glibc/
Summary : The GNU libc libraries
Description :
The glibc package contains standard libraries which are used by
multiple programs on the system. In order to save disk space and
memory, as well as to make upgrading easier, common system code is
kept in one place and shared between programs. This particular package
contains the most important sets of shared libraries: the standard C
library and the standard math library. Without these two libraries, a
Linux system will not function.

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Update Information:

This glibc update contains a fix for a double-free in the nscd netgroup cache,
and improves debugging information by: * not removing debugging information
from ld.so * adjusting to changes in rpm in order to keep stripping debugging
information from binaries * removing a conflict between contents of 32 and 64
bit debuginfo packages so they can remain installed simultaneously on a system
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ChangeLog:

* Wed May 19 2021 Arjun Shankar - 2.32-6
- Use distribution mechanism for debuginfo (#1661510, #1886295, #1905611)
* Tue May 18 2021 Arjun Shankar - 2.32-5
- Auto-sync with upstream branch release/2.32/master,
commit 1799ac8eabe87acd7b1ef7c3a483171489563482:
- support: Typo and formatting fixes
- support: Pass environ to child process
- Fix SXID_ERASE behavior in setuid programs (BZ #27471)
- Enhance setuid-tunables test
- tst-env-setuid: Use support_capture_subprogram_self_sgid
- support: Add capability to fork an sgid child
- S390: Also check vector support in memmove ifunc-selector [BZ #27511]
- powerpc64: Workaround sigtramp vdso return call
- nscd: Fix double free in netgroupcache [BZ #27462]
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References:

[ 1 ] Bug #1661510 - glibc: Adjust to rpm's find-debuginfo.sh changes, to keep stripping binaries [Fedora]
  https://bugzilla.redhat.com/show_bug.cgi?id=1661510
[ 2 ] Bug #1886295 - glibc: ldconfig debuginfo file conflict between i686 and x86_64
  https://bugzilla.redhat.com/show_bug.cgi?id=1886295
[ 3 ] Bug #1905611 - glibc: Do not remove debugging information from ld.so
  https://bugzilla.redhat.com/show_bug.cgi?id=1905611
[ 4 ] Bug #1932590 - CVE-2021-27645 glibc: Use-after-free in addgetnetgrentX function in netgroupcache.c [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1932590
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-2ba993d6c5' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys