RHSA-2026:95618: Moderate: glibc security update
Moderate: glibc security update
Other sources
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: nscd stack overflow leads to degraded DNS resolution (CVE-2026-89092) glibc: glibc DNS stub resolver: Denial of Service via long search domain in configuration (CVE-2026-8674) glibc: glibc: Privilege escalation and arbitrary code execution via TOCTOU race condition in dynamic loader (CVE-2026-86805) glibc: glibc: Local attacker can cause denial of service and information disclosure via stack-based buffer overflow. (CVE-2026-95818) 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.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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redhat/glibcto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-debuginfoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-debugsourceto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-develto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-docto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-gconv-extra-debuginfoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-headersto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-akto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-anto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-astto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-azto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bgto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bhoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-boto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-brto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-brxto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bsto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bynto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-cato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-dsbto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-esto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-etto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-euto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-fato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-filto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-fyto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-gato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-gdto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-gezto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-glto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-guto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-gvto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-hato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-hakto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-hyto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-iato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-idto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-igto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-ikto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-klto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-knto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-koto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-mrto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-msto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-mtto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-myto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-ndsto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-niuto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-nlto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-nnto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-nrto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-nsoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-octo a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-omto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-osto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-pato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-quzto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-rwto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-satto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-scto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-sdto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-seto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-sidto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-skto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-slto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-smto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-srto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-szlto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-tgto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-thto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-theto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-tito a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-tigto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-tnto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-toto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-tpito a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-vito a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-xhto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-yito a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-yoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-locale-sourceto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-utilsto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-utils-debuginfoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/libnslto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/libnsl-debuginfoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/nscdto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/nscd-debuginfoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-all-langpacksto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bemto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-berto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bnto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-csto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-heto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-isto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-jato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-kato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-magto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-mhrto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-mjwto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-minimal-langpackto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-aato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-agrto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-aycto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-bito a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-cvto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-elto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-eoto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-foto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-huto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-kmto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-mgto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-ukto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-woto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibc-langpack-yuwto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4 - Upgrade
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redhat/glibcto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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redhat/glibc-develto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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redhat/glibc-langpack-aato a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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redhat/glibc-langpack-akto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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redhat/glibc-langpack-bemto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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redhat/glibc-langpack-bnto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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redhat/glibc-langpack-boto a version that resolves this vulnerability.Fixed in 2.34-284.el9_8.4.aa - Upgrade
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Event History
Frequently Asked Questions
Which systems are most exposed to these issues?
Systems using the affected glibc packages are exposed because glibc supplies core libc, threading, math, DNS resolver, and nscd functionality used by many programs. Systems running nscd or relying on DNS search-domain configuration have additional exposure to the DNS-related issues.
Does exploitation require local access?
At least two listed issues explicitly involve a local attacker: the dynamic-loader TOCTOU race can lead to privilege escalation and arbitrary code execution, and a stack-based buffer overflow can cause denial of service and information disclosure. The advisory does not state the access requirements for the nscd or DNS resolver issues.
What could happen if this update is not applied?
Impacts listed include degraded DNS resolution, denial of service, information disclosure, privilege escalation, and arbitrary code execution. The dynamic-loader flaw is particularly significant because it combines a race condition with privilege escalation and code execution.