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CVE-2026-88812 is a double-free vulnerability in XKB SetGeometry TextDoodad processing in X.Org Server and Xwayland. CheckSetDoodad() frees doodad->text.text on an error path without clearing the pointer. Subsequent cleanup through _XkbClearDoodad() frees the same pointer again. The vulnerability affects releases preceding 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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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.
A double-free vulnerability in X.Org Server's XKB geometry handling. An authenticated X client can submit a crafted XkbSetGeometry request containing a malformed TextDoodad entry, causing heap corruption and potentially arbitrary code execution or a crash. The advisory rates it Important with CVSS 3.1 score 7.8. An upstream fix is available in xorg-server 21.1.25, but the listed affected Amazon Linux packages remain 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A vulnerability affecting outdated xorg-server packages covered by the Slackware security update. The reference provides no individual technical description; Nessus detects exposure using the application's self-reported version rather than testing the vulnerability.
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.