CVE-2024-38543

MediumCVSS 5.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= b2ef9f5a5cb37643ca5def3516c546457074b882, < 1a21fdeea502658e315bd939409b755974f4fb64; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < 65e528a69cb3ed4a286c45b4afba57461c8b5b33; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < ce47e8ead9a72834cc68431d53f8092ce69bebb7; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < 3b20d18f475bd17309db640dbe7d7c7ebb5bc2bc; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < c2af060d1c18beaec56351cf9c9bcbbc5af341a3
LinuxLinux5.8

References

Timeline

Published
Jun 19, 2024
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2024-38543: Medium severity, CVSS 5.5 | Vulnix