> CVE-2022-22253: Huawei HWLog Memory Corruption Via Race Condition

In this advisory we are disclosing a memory corruption vulnerability in the Huawei log device that allows any unprivileged process to trigger a kernel crash and reboot the device. Huawei kernels are shipped with custom log devices (/dev/hwlog_dubai, /dev/hwlog_exception and /dev/hwlog_jank) that facilitate better system diagnostics through a series of ioctl calls. One of these diagnostics module is referred to as memcheck, and it provides detailed statistics about the system memory usage, including the allocations made by the SLAB kernel allocator. The implementation of this SLAB tracer contains a series of race condition vulnerabilities that could lead to kernel memory corruption and kernel deadlocks.