CVE-2024-31083: xorg-server Use After Free

Vulnerability summary

CVE-2024-31083 is a high (CVSS 7.8) Use After Free vulnerability in xorg-server. EPSS estimates a 1.86% chance of exploitation in the next 30 days, higher than 78.9% of scored vulnerabilities.

Timeline

1. 05-04-2024
   PublishedVulnerability first disclosed.
2. 20-11-2025
   Last modifiedVulnerability information updated.

Description

A use-after-free vulnerability was found in the ProcRenderAddGlyphs() function of Xorg servers. This issue occurs when AllocateGlyph() is called to store new glyphs sent by the client to the X server, potentially resulting in multiple entries pointing to the same non-refcounted glyphs. Consequently, ProcRenderAddGlyphs() may free a glyph, leading to a use-after-free scenario when the same glyph pointer is subsequently accessed. This flaw allows an authenticated attacker to execute arbitrary code on the system by sending a specially crafted request.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.