CVE-2022-49641: 
Linux Kernel vulnerability analysis and mitigation

CVE-2022-49641 is a vulnerability in the Linux kernel's sysctl subsystem, specifically in the proc_douintvec() function. The vulnerability was discovered and disclosed in February 2025, affecting the Linux kernel's sysctl implementation. The issue involves data races in concurrent access to sysctl variables, which could potentially lead to data corruption (Kernel Git).

The vulnerability stems from a data race condition in the procdouintvec() function within the kernel's sysctl implementation. When a sysctl variable is accessed concurrently, there exists a possibility of data-race conditions due to load/store-tearing. The issue was originally introduced in commit e7d316a02f68 which handled error writing UINTMAX to u32 fields (Kernel Git).

The vulnerability could lead to data corruption due to concurrent access to sysctl variables. When multiple processes access the same sysctl variable simultaneously, the lack of proper synchronization mechanisms could result in inconsistent or corrupted values (Kernel Git).

The issue has been fixed by implementing proper synchronization mechanisms using READONCE() and WRITEONCE() macros internally in the proc_douintvec() function. This change provides basic protection to avoid load/store-tearing during concurrent access. The fix has been implemented across multiple kernel versions (Kernel Git).