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CVE-2026-93518 is a numeric-truncation vulnerability in the XKB XkbResizeKeyType() function in X.Org Server and Xwayland. The expression (nTotal * 15) / 10 can exceed 65535 and is truncated when assigned to the unsigned short size_syms variable. The truncated allocation size produces an undersized heap buffer that subsequent writes overflow. The vulnerability affects releases preceding the fixes in xorg-server 21.1.25 and Xwayland 24.1.14.
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11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
An integer truncation in X.Org X server's XkbResizeKeyType() causes an undersized heap allocation and subsequent heap buffer overflow. An authenticated X client can trigger the flaw through crafted XKB key-type resize requests, potentially causing arbitrary code execution or denial of service. The advisory rates it Important, with CVSS v3.1 score 7.8. An upstream fix is available in xorg-server 21.1.25, while affected Amazon Linux packages are listed as Pending Fix.
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A vulnerability affecting outdated xorg-server packages on Slackware Linux 15.0 and -current.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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.