CVE-2024-31080

Published: 4 March 2024

A heap-based buffer over-read vulnerability was found in the X.org server's ProcXIGetSelectedEvents() function. This issue occurs when byte-swapped length values are used in replies, potentially leading to memory leakage and segmentation faults, particularly when triggered by a client with a different endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory values and then transmit them back to the client until encountering an unmapped page, resulting in a crash. Despite the attacker's inability to control the specific memory copied into the replies, the small length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds reads.

Notes

xorg server is actually the xorg-server package
the xorg package only contains docs
xwayland package contains parts of xorg-server

introduced in xorg-server-1.7.0

Status

References

• https://ubuntu.com/security/notices/USN-6721-1
• https://www.cve.org/CVERecord?id=CVE-2024-31080
• NVD
• Launchpad
• Debian