NULL Pointer Dereference Affecting kernel-debug-modules package, versions *
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGMODULES-7330500
- published 21 Jun 2024
- disclosed 19 Jun 2024
Introduced: 19 Jun 2024
CVE-2024-38543 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:8 kernel-debug-modules.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-modules package and not the kernel-debug-modules package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2024-38543
- https://git.kernel.org/stable/c/1a21fdeea502658e315bd939409b755974f4fb64
- https://git.kernel.org/stable/c/3b20d18f475bd17309db640dbe7d7c7ebb5bc2bc
- https://git.kernel.org/stable/c/65e528a69cb3ed4a286c45b4afba57461c8b5b33
- https://git.kernel.org/stable/c/c2af060d1c18beaec56351cf9c9bcbbc5af341a3
- https://git.kernel.org/stable/c/ce47e8ead9a72834cc68431d53f8092ce69bebb7