Amazon Linux 2 Security Advisory: ALAS2-2026-3792
Advisory Released Date: 2026-07-08
Advisory Updated Date: 2026-07-08
Severity:
Important
Issue Overview:
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root. (CVE-2026-50259)
Affected Packages:
tigervnc
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update tigervnc or yum update --advisory ALAS2-2026-3792 to update your system.
New Packages:
aarch64:
tigervnc-1.8.0-24.amzn2.0.10.aarch64
tigervnc-server-1.8.0-24.amzn2.0.10.aarch64
tigervnc-server-minimal-1.8.0-24.amzn2.0.10.aarch64
tigervnc-server-module-1.8.0-24.amzn2.0.10.aarch64
tigervnc-debuginfo-1.8.0-24.amzn2.0.10.aarch64
i686:
tigervnc-1.8.0-24.amzn2.0.10.i686
tigervnc-server-1.8.0-24.amzn2.0.10.i686
tigervnc-server-minimal-1.8.0-24.amzn2.0.10.i686
tigervnc-server-module-1.8.0-24.amzn2.0.10.i686
tigervnc-debuginfo-1.8.0-24.amzn2.0.10.i686
noarch:
tigervnc-server-applet-1.8.0-24.amzn2.0.10.noarch
tigervnc-license-1.8.0-24.amzn2.0.10.noarch
tigervnc-icons-1.8.0-24.amzn2.0.10.noarch
src:
tigervnc-1.8.0-24.amzn2.0.10.src
x86_64:
tigervnc-1.8.0-24.amzn2.0.10.x86_64
tigervnc-server-1.8.0-24.amzn2.0.10.x86_64
tigervnc-server-minimal-1.8.0-24.amzn2.0.10.x86_64
tigervnc-server-module-1.8.0-24.amzn2.0.10.x86_64
tigervnc-debuginfo-1.8.0-24.amzn2.0.10.x86_64