Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-175
Advisory Release Date: 2026-10-12 09:00 Pacific
Advisory Updated Date: 2026-10-20 15:48 Pacific
Package updates are available for Amazon Linux 2027 that fix the following vulnerabilities:
CVE-2026-59679:
A flaw was found in the libXfont2 font-server client. A remote attacker, by operating a malicious font server, could exploit an out-of-bounds read/write vulnerability. This occurs because the client incorrectly handles font data, leading to an out-of-bounds memory access. This can lead to privilege escalation if the X server runs with root privileges, or a denial of service (crash) if it runs as an unprivileged user.
CVE-2026-44950:
A flaw was found in the libXfont2 font-server client. This heap buffer overflow vulnerability allows a malicious font server to send specially crafted glyph data. The fs_read_glyphs() function fails to properly validate the total size of the incoming data, leading to an overwrite of memory beyond the intended buffer. If the X server runs as a privileged user, this could result in privilege escalation, allowing an attacker to gain higher access. If the X server runs as an unprivileged user, it could lead to a denial of service, causing the system to crash.
Affected Packages:
libXfont2
Issue Correction:
Run dnf update libXfont2 or dnf update --advisory ALAS2027-2026-175 to update your system.
aarch64:
libXfont2-debuginfo-2.0.8-1.amzn2027.0.1.aarch64
libXfont2-devel-2.0.8-1.amzn2027.0.1.aarch64
libXfont2-2.0.8-1.amzn2027.0.1.aarch64
libXfont2-debugsource-2.0.8-1.amzn2027.0.1.aarch64
src:
libXfont2-2.0.8-1.amzn2027.0.1.src
x86_64:
libXfont2-debugsource-2.0.8-1.amzn2027.0.1.x86_64
libXfont2-debuginfo-2.0.8-1.amzn2027.0.1.x86_64
libXfont2-devel-2.0.8-1.amzn2027.0.1.x86_64
libXfont2-2.0.8-1.amzn2027.0.1.x86_64