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A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in 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 within a window on one screen to the root window of the other screen and if the original window is destroyed followed by another window being destroyed.

CVE-2023-5380 is a use-after-free vulnerability identified in the xorg-x11-server component of Red Hat Enterprise Linux 7. The flaw manifests in a very specific and legacy configuration known as Zaphod mode, which supports multi-screen setups with multiple protocol screens. The vulnerability occurs when the pointer is warped from within a window on one screen to the root window of another screen, and the original window is destroyed followed by the destruction of another window. This sequence leads to a use-after-free condition in the X server, causing it to crash and resulting in a denial of service. The vulnerability requires local access with low privileges (AV:L/PR:L) and has a high attack complexity (AC:H), meaning exploitation is difficult and requires specific conditions. There is no requirement for user interaction (UI:N), and the scope is unchanged (S:U). The impact is limited to availability (A:H) with no confidentiality or integrity impact. No known exploits are currently in the wild, and no patches were linked at the time of publication. This vulnerability primarily affects legacy systems still running Red Hat Enterprise Linux 7 with multi-screen Zaphod mode configurations, which are uncommon in modern environments but may persist in certain industrial or specialized use cases.

Detailed information about CVE-2023-5380: Use After Free in Red Hat Red Hat Enterprise Linux 7 affecting Red Hat Red Hat Enterprise Linux 7. Get real-time updat

CVE-2023-5380: Use After Free in Red Hat Red Hat Enterprise Linux 7 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-5380: Use After Free in Red Hat Red Hat Enterprise Linux 7

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