RHSA-2026:68574 - Security Advisory

Topic

An update for corosync is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact of Important. 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: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly (CVE-2026-81665)

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 High Availability for x86_64 - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Resilient Storage for x86_64 - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux High Availability for IBM Power, little endian - Extended Life Cycle Support 7 ppc64le
• Red Hat Enterprise Linux Resilient Storage for IBM Power, little endian - Extended Life Cycle Support 7 ppc64le

Fixes

• BZ - 2524910 - CVE-2026-81665 corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly

CVEs

• CVE-2026-81665

References

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