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A use-after-free flaw was found in the Linux Kernel. When a disk is removed, bdi_unregister is called to stop further write-back and waits for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation work after this has completed, which can result in the timer attempting to access the recently freed bdi_writeback.

CVE-2024-0562 is a use-after-free vulnerability discovered in the Linux Kernel, specifically triggered during the removal of a disk device. When a disk is removed, the kernel function bdi_unregister is invoked to halt further write-back operations and waits for any associated delayed work to complete. However, the function wb_inode_writeback_end() may still schedule bandwidth estimation work after this waiting period, which leads to a timer attempting to access the bdi_writeback structure that has already been freed. This use-after-free condition can cause the kernel to access invalid memory, potentially resulting in a system crash (denial of service) or enabling an attacker with local privileges to execute arbitrary code within the kernel context. The vulnerability requires local access with low privileges and does not require user interaction, making it easier to exploit in environments where local access is possible. The CVSS v3.1 score is 7.8, reflecting high severity due to the potential for full system compromise affecting confidentiality, integrity, and availability. Although no public exploits have been reported yet, the nature of the flaw and its presence in the Linux kernel make it a significant risk. The vulnerability affects all Linux kernel versions prior to the patch and is relevant for systems that dynamically handle disk removal, including servers, desktops, and embedded devices running Linux. The flaw was publicly disclosed on January 15, 2024, and is tracked under CVE-2024-0562.

Detailed information about CVE-2024-0562: Use After Free. Get real-time updates, technical details, and mitigation strategies.

CVE-2024-0562: Use After Free - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2024-0562: Use After Free

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