RHSA-2026:93538 - Security Advisory

Topic

An update for freerdp is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

Security Fix(es):

• FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command (CVE-2026-91954)
• FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU (CVE-2026-91964)
• FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel (CVE-2026-91956)
• FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure (CVE-2026-91963)
• FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway (CVE-2026-91959)
• FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption. (CVE-2026-91953)

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 Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2533906 - CVE-2026-91954 FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command
• BZ - 2533911 - CVE-2026-91964 FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU
• BZ - 2533927 - CVE-2026-91956 FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel
• BZ - 2533930 - CVE-2026-91963 FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure
• BZ - 2533951 - CVE-2026-91959 FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway
• BZ - 2533959 - CVE-2026-91953 FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption.

CVEs

• CVE-2026-91953
• CVE-2026-91954
• CVE-2026-91956
• CVE-2026-91959
• CVE-2026-91963
• CVE-2026-91964

References

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