CVE-2023-52798: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-52798 is a vulnerability in the Linux kernel's ath11k WiFi driver, specifically related to DFS (Dynamic Frequency Selection) radar event locking. The issue was discovered in the handling of active pdevs (physical devices) that are protected by RCU (Read-Copy-Update) mechanism, where the DFS radar event handling code was not properly marked as a read-side critical section (Kernel Git).

The vulnerability stems from a locking issue in the ath11k driver's DFS radar event handling code. Specifically, the ath11k_mac_get_ar_by_pdev_id() function was called without being marked as a read-side critical section, despite the active pdevs being protected by RCU. This could potentially lead to use-after-free issues. The fix involves marking the relevant code section with proper RCU read-side critical section markers (Kernel Git).

The vulnerability affects the Linux kernel's wireless networking capabilities, specifically for systems using Qualcomm IEEE 802.11ax devices with the ath11k driver. The issue has been present since the introduction of the driver with commit d5c65159f289 (Kernel Git).

The issue has been fixed in the Linux kernel through a patch that properly implements RCU read-side critical section markers. The fix involves adding rcu_read_lock() and rcu_read_unlock() calls around the affected code section. The patch has been merged into the kernel and is available in updated versions (Kernel Git).