CVE-2023-53587: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53587 is a vulnerability in the Linux kernel's ring-buffer functionality, discovered and disclosed in October 2025. The issue affects the kernel's IRQ work synchronization mechanism before buffer destruction. This vulnerability specifically impacts Linux kernel versions up to 6.3.0-rc1 (NVD).

The vulnerability occurs when something is written to the buffer just before destruction, making it possible to destroy the ringbuffer before the IRQ work has completed execution. This leads to a KASAN slab-use-after-free error in irqworkrun_list, specifically reading 8 bytes at address 000000006d640a48. The issue arose after changes to the IRQ work system, as previously there was only a single global IRQ work (NVD).

The vulnerability can result in a system crash or potential memory corruption. While the issue was primarily identified in ARCH=um with time-travel testing environments, it could potentially affect real systems. The bug involves accessing freed memory regions, specifically a 584-byte area inside a freed 1024-byte region (NVD).

The fix involves adding appropriate irqworksync() calls to ensure work completion before buffer destruction. Multiple Linux distributions have released patches, including Debian Bullseye (5.10.244-1), Bookworm (6.1.153-1), and Trixie (6.12.48-1) (Debian Security).