RLSA-2026:95618: Moderate: glibc security update

Q: Which systems are most likely to be exposed to these issues?

Rocky Linux systems using the affected glibc packages are exposed. Because glibc supplies core system libraries used by multiple programs, the impact can extend beyond a single application.

Q: What attacker access or conditions are described for exploitation?

One issue is described as exploitable by a local attacker and may cause denial of service and information disclosure. Another involves a TOCTOU race condition in the dynamic loader that can lead to privilege escalation and arbitrary code execution; the DNS resolver and nscd issues involve degraded DNS resolution or denial of service.

Q: Is a default configuration known to be affected?

The provided information does not state whether default configurations are affected. One DNS denial-of-service issue specifically involves a long search domain in configuration, so DNS configuration is relevant to that issue.

Published Nov 6, 2026

Updated

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.

Affected Software

1 affected componentFixes available

rocky-linux/glibc<0:2.34-284.el9_8.4

0:2.34-284.el9_8.4

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade rocky-linux/glibc to a version that resolves this vulnerability.
Fixed in 0:2.34-284.el9_8.4

Event History

Nov 6, 2026

Advisory Published

via OSV·12:04 PM

Data Sourced

via OSV·12:04 PM

DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

Which systems are most likely to be exposed to these issues?

Rocky Linux systems using the affected glibc packages are exposed. Because glibc supplies core system libraries used by multiple programs, the impact can extend beyond a single application.

What attacker access or conditions are described for exploitation?

One issue is described as exploitable by a local attacker and may cause denial of service and information disclosure. Another involves a TOCTOU race condition in the dynamic loader that can lead to privilege escalation and arbitrary code execution; the DNS resolver and nscd issues involve degraded DNS resolution or denial of service.

Is a default configuration known to be affected?

The provided information does not state whether default configurations are affected. One DNS denial-of-service issue specifically involves a long search domain in configuration, so DNS configuration is relevant to that issue.

RLSA-2026:95618: Moderate: glibc security update

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

Which systems are most likely to be exposed to these issues?

What attacker access or conditions are described for exploitation?

Is a default configuration known to be affected?

Company

Resources

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Frequently Asked Questions

Which systems are most likely to be exposed to these issues?

What attacker access or conditions are described for exploitation?

Is a default configuration known to be affected?