RHSA-2026:59312 - Security Advisory

Topic

An update for libXfont2 is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

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

X.Org X11 libXfont2 runtime library

Security Fix(es):

• libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)
• libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client (CVE-2026-44950)

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 - AUS 9.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x

Fixes

• BZ - 2509620 - CVE-2026-59679 libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write
• BZ - 2509622 - CVE-2026-44950 libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client

CVEs

• CVE-2026-44950
• CVE-2026-59679

References

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