CVE-2023-5574: redhat enterprise_linux Use After Free

Vulnerability summary

CVE-2023-5574 is a high (CVSS 7.0) Use After Free vulnerability in redhat enterprise_linux. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.7% of scored vulnerabilities.

Timeline

1. 25-10-2023
   PublishedVulnerability first disclosed.
2. 11-07-2026
   Last modifiedVulnerability information updated.

Description

A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.

• 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.