CVE-2024-46847

CVSS 3.1 Score 5.5 of 10 (medium)

Details

Published Sep 27, 2024
Updated: Oct 2, 2024
CWE ID 129

Summary

CVE-2024-46847 is a vulnerability in the Linux kernel where a new 'vmap_block' is instantiated with an uninitialized 'cpu' field. This issue allows another CPU, while walking the 'vmap_block_queue' array, to perform an out-of-bounds access due to an uninitialized index. This vulnerability has been observed to cause UBSAN errors in Android's kernel, specifically in the '_vm_unmap_aliases' function. The issue is resolved by moving the initialization of 'vb->cpu' in new_vmap_block() ahead of adding the structure to the queue.

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