Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-50259: 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.
Fixed packages 8
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | tigervnc | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-debuginfo | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-icons | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-license | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-server | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-server-applet | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-server-minimal | 0:1.8.0-24.amzn2.0.10 |
| Amazon Linux · 2 | tigervnc-server-module | 0:1.8.0-24.amzn2.0.10 |
Vulnerabilities 1
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High 7.8
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing
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 o…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-50259.html