XOrg Server 21.1.22 and Xwayland 24.1.10 Released with Multiple Security Fixes
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XOrg Server 21.1.22 and Xwayland 24.1.10 Released with Multiple Security Fixes

Written By
MN
Marcus Nestor
May 4, 2026

These releases are here to fix CVE-2026-33999, an XKB integer underflow in the XkbSetCompatMap() function that can lead to buffer read overrun when processing a future request if a “compat” buffer was previously truncated, leaving unused space in the buffer. The code in XkbSetCompatMap() will use that space, but fails to update the number of valid entries actually in the buffer.
MN

Marcus Nestor

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