RHSA-2026:14205 - Security Advisory

Topic

An update for corosync is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The corosync packages provide the Corosync Cluster Engine and C APIs for Red Hat Enterprise Linux cluster software.

Security Fix(es):

• corosync: Corosync: Denial of Service and information disclosure via crafted UDP packet (CVE-2026-35091)
• corosync: Corosync: Denial of Service via integer overflow in join message validation (CVE-2026-35092)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux High Availability for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux High Availability for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux High Availability (for IBM z Systems) - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux High Availability (for ARM 64) - Extended Update Support 10.0 aarch64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux High Availability for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux High Availability for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64
• Red Hat Enterprise Linux High Availability for Power, little endian - 4 years of updates 10.0 ppc64le
• Red Hat Enterprise Linux High Availability for x86_64 - 4 years of updates 10.0 x86_64

Fixes

• BZ - 2453813 - CVE-2026-35091 corosync: Corosync: Denial of Service and information disclosure via crafted UDP packet
• BZ - 2453814 - CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation

CVEs

• CVE-2026-35091
• CVE-2026-35092

References

• https://access.redhat.com/security/updates/classification/#moderate