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CVE-2026-93521 is a heap buffer overflow in the RandR RRChangeProviderProperty() function in X.Org Server and Xwayland. When processing PrependMode, the function sets new_value.size to len rather than total_len. It also uses prop_value->size instead of len when calculating the destination offset for copying existing property data. These errors cause a heap buffer overflow when property data is prepended. The flaw repeats a bug pattern previously corrected in RRChangeOutputProperty(), without the corresponding correction being applied to the provider-property path. Fixes are available in xorg-server 21.1.25 and Xwayland 24.1.14.
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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 the RandR provider property handling path allows an authenticated X client to potentially execute arbitrary code or cause denial of service by sending ChangeProviderProperty requests using PrependMode. Exploitation requires a system with RandR providers, which the advisory describes as standard on modern GPUs. The advisory rates the vulnerability Important, with a CVSS v3.1 score of 7.8. Upstream fixes are available in xorg-server 21.1.25 and xwayland 24.1.14, while the listed affected Amazon Linux packages remain marked 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A vulnerability affecting outdated xorg-server packages on Slackware Linux 15.0 and -current.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.
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Cross-references every affected SKU, including bundled OEM variants.
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