CVE-2024-57881 - Linux Kernel "pfn_to_page" NULL Pointer Dereference Vulnerability in Buddy Allocator

CVE-2024-57881 - Linux Kernel "pfn_to_page" NULL Pointer Dereference Vulnerability in Buddy Allocator

https://cvefeed.io/rssfeed/latest.atom / Sat, 01/11/2025 - 21:34
CVE ID : CVE-2024-57881
Published : Jan. 11, 2025, 4:15 p.m. | 4 hours, 19 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy() In split_large_buddy(), we might call pfn_to_page() on a PFN that might not exist. In corner cases, such as when freeing the highest pageblock in the last memory section, this could result with CONFIG_SPARSEMEM && !CONFIG_SPARSEMEM_EXTREME in __pfn_to_section() returning NULL and and __section_mem_map_addr() dereferencing that NULL pointer. Let's fix it, and avoid doing a pfn_to_page() call for the first iteration, where we already have the page. So far this was found by code inspection, but let's just CC stable as the fix is easy.
Severity: 0.0 | NA
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