CVE-2024-38543: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure The kcalloc() in dmirror_device_evict_chunk() will return null if the physical memory has run out. As a result, if src_pfns or dst_pfns is dereferenced, the null pointer dereference bug will happen. Moreover, the device is going away. If the kcalloc() fails, the pages mapping a chunk could not be evicted. So add a __GFP_NOFAIL flag in kcalloc(). Finally, as there is no need to have physically contiguous memory, Switch kcalloc() to kvcalloc() in order to avoid failing allocations.

Affected products

• Linux Linux Kernel: from 5.8, before 6.1.93 (fixed in 6.1.93); from 6.2, before 6.6.33 (fixed in 6.6.33); from 6.7, before 6.8.12 (fixed in 6.8.12); from 6.9, before 6.9.3 (fixed in 6.9.3)

Published 2024-06-19. Last modified 2026-06-17.