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A flaw was found in the X.Org server. The cursor code in both Xephyr and Xwayland uses the wrong type of private at creation. It uses the cursor bits type with the cursor as private, and when initiating the cursor, that overwrites the XSELINUX context.

CVE-2024-0409 is an out-of-bounds write vulnerability identified in the X.Org server version 21.1.0, specifically within the cursor handling code of Xephyr and Xwayland components. The root cause is the misuse of private data types during cursor creation: the code incorrectly uses the cursor bits type with the cursor as private data. This mismatch leads to an out-of-bounds write that overwrites the XSELINUX security context, a critical structure used for enforcing SELinux policies. Overwriting this context can allow an attacker to escalate privileges or bypass security controls, potentially leading to full system compromise. The vulnerability requires local access with low privileges and does not require user interaction, making it a significant risk in multi-user or shared environments. The CVSS v3.1 score of 7.8 reflects high impact on confidentiality, integrity, and availability, with low attack complexity but requiring local privileges. Although no known exploits are reported in the wild, the vulnerability's nature and impact make it a critical concern for affected systems. The flaw affects Linux systems running X.Org server 21.1.0 with Xephyr or Xwayland enabled, which are common in graphical desktop environments and nested X server setups. The vulnerability was published on January 18, 2024, and assigned by Red Hat, indicating its recognition in enterprise Linux distributions. No patches were linked at the time of reporting, so users should monitor vendor advisories closely.

Detailed information about CVE-2024-0409: Out-of-bounds Write. Get real-time updates, technical details, and mitigation strategies.

CVE-2024-0409: Out-of-bounds Write - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2024-0409: Out-of-bounds Write

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