update: glibc

[dongsupark]

Name: glibc
CVEs: CVE-2026-4437, CVE-2026-4438
CVSSs: 7.5, 5.4
Action Needed: TBD

Summary:

• CVE-2026-4437: Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version 2.34 to version 2.43 could, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.
  • https://bugzilla.redhat.com/show_bug.cgi?id=2449777
• CVE-2026-4438: Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.
  • https://bugzilla.redhat.com/show_bug.cgi?id=2449783

refmap.gentoo: TBD