CVE - CVE-2024-45022

CVE-ID
CVE-2024-45022	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0 The __vmap_pages_range_noflush() assumes its argument pages contains pages with the same page shift. However, since commit e9c3cda4d86e ("mm, vmalloc: fix high order __GFP_NOFAIL allocations"), if gfp_flags includes __GFP_NOFAIL with high order in vm_area_alloc_pages() and page allocation failed for high order, the pages may contain two different page shifts (high order and order-0). This could lead __vmap_pages_range_noflush() to perform incorrect mappings, potentially resulting in memory corruption. Users might encounter this as follows (vmap_allow_huge = true, 2M is for PMD_SIZE): kvmalloc(2M, __GFP_NOFAIL\|GFP_X) __vmalloc_node_range_noprof(vm_flags=VM_ALLOW_HUGE_VMAP) vm_area_alloc_pages(order=9) ---> order-9 allocation failed and fallback to order-0 vmap_pages_range() vmap_pages_range_noflush() __vmap_pages_range_noflush(page_shift = 21) ----> wrong mapping happens We can remove the fallback code because if a high-order allocation fails, __vmalloc_node_range_noprof() will retry with order-0. Therefore, it is unnecessary to fallback to order-0 here. Therefore, fix this by removing the fallback code.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/61ebe5a747da649057c37be1c37eb934b4af79ca URL:https://git.kernel.org/stable/c/61ebe5a747da649057c37be1c37eb934b4af79ca MISC:https://git.kernel.org/stable/c/c91618816f4d21fc574d7577a37722adcd4075b2 URL:https://git.kernel.org/stable/c/c91618816f4d21fc574d7577a37722adcd4075b2 MISC:https://git.kernel.org/stable/c/de7bad86345c43cd040ed43e20d9fad78a3ee59f URL:https://git.kernel.org/stable/c/de7bad86345c43cd040ed43e20d9fad78a3ee59f MISC:https://git.kernel.org/stable/c/fd1ffbb50ef4da5e1378a46616b6d7407dc795da URL:https://git.kernel.org/stable/c/fd1ffbb50ef4da5e1378a46616b6d7407dc795da
Assigning CNA
kernel.org
Date Record Created
20240821	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240821)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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