CVE-2025-39843 mm: slub: avoid wake up kswapd in set_track_prepare

In the Linux kernel, the following vulnerability has been resolved: mm: slub: avoid wake up kswapd in settrackprepare settrackprepare can incur lock recursion. The issue is that it is called from hrtimerstartrangens holding the percpuhrtimerbasesn.lock, but when enabled CONFIGDEBUGOBJECTSTIMERS,...

CVE-2025-39843

CVE-2025-39843 affects the Linux kernel mm/slub path. The vulnerability arises when set_track_prepare() can incur lock recursion due to waking up kswapd while holding per_cpu(hrtimer_bases)[n].lock (triggered via hrtimer_start_range_ns) under CONFIG_DEBUG_OBJECTS_TIMERS. The fix involves masking ...