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CVE-2026-93517 is a heap buffer overflow in GLX RenderLarge request processing in X.Org Server and Xwayland. An authenticated X client can trigger the overflow by submitting a crafted request in which dataBytes exceeds cmdlen. Successful exploitation can result in arbitrary code execution or denial of service. The vulnerability affects versions preceding the fixed upstream releases xorg-server 21.1.25 and xwayland 24.1.14.
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No public exploit code observed for this vulnerability.
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A vulnerability affecting Fedora 44's xorg-x11-server-Xwayland package, addressed by advisory FEDORA-2026-2448dda850. The content does not describe its technical cause or individual impact.
A heap buffer overflow in GLX RenderLarge request handling occurs because a buffer allocated using cmdlen receives dataBytes through memcpy without validating that dataBytes does not exceed cmdlen. An authenticated X client can exploit the flaw to potentially execute arbitrary code or cause denial of service. The advisory rates it Important, with a CVSS v3.1 score of 7.8. An upstream fix is identified in xorg-server 21.1.25, but fixes for the listed affected Amazon Linux packages remain pending.
A vulnerability affecting Alpine Linux xorg-server and related packages. The reference does not describe its technical mechanism or individual severity. Updating to version 21.1.25-r0 or later is the stated remediation.
A vulnerability affecting outdated xorg-server packages on Slackware Linux 15.0 and -current. Individual technical details are not provided. Updated packages are available, and the plugin states that no known exploits are available.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.