Red Hat: CVE-2024-38543: kernel: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure (Multiple Advisories)

Red Hat: CVE-2024-38543: kernel: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure (Multiple Advisories)

Severity

4

CVSS

(AV:L/AC:H/Au:M/C:N/I:N/A:C)

Published

06/19/2024

Created

12/06/2024

Added

12/05/2024

Modified

12/05/2024

Description

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.

Solution(s)

• redhat-upgrade-kernel
• redhat-upgrade-kernel-rt

References

• CVE-2024-38543
• RHSA-2024:4583