CVE-2025-39843

A deadlock lock recursion vulnerability exists in the linux kernel such that when CONFIG_DEBUG_OBJECTS_TIMERS is set, may wake up kswapd in set_track_prepare, and try to hold the per_cpu(hrtimer_bases) lock.

This issue can only occur on debug kernel builds with specific configuration options enabled (e.g. CONFIG_SLUB_DEBUG, CONFIG_STACKDEPOT, SLAB_STORE_USER). It may lead to a deadlock (spinlock recursion) under rare timing conditions but cannot be triggered on standard production kernels. The impact is limited to a local denial of service.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.