RHSA-2026:66524 - Security Advisory

Topic

An update for openssl is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION.

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

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

• openssl: SSL_select_next_proto buffer overread (CVE-2024-5535)
• openssl: Heap Use-After-Free in OpenSSL PKCS7_verify() (CVE-2026-45447)

Bug Fix(es) and Enhancement(s):

• Openssl builds failing in rhel6 due to failing tests (JIRA:RHEL-184262)

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 Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 2294581 - CVE-2024-5535 openssl: SSL_select_next_proto buffer overread
• BZ - 2481898 - CVE-2026-45447 openssl: Heap Use-After-Free in OpenSSL PKCS7_verify()

CVEs

• CVE-2024-5535
• CVE-2026-45447

References

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