CVE-2024-57881 (GCVE-0-2024-57881)

Vulnerability from cvelistv5 – Published: 2025-01-11 15:10 – Updated: 2025-10-01 19:57
VLAI?
Title
mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy()
Summary
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 ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fd919a85cd55be5d00a6a7372071f44c8eafb825 , < 4234ca9884bcae9e48ed38652d91696ad5cd591d (git)
Affected: fd919a85cd55be5d00a6a7372071f44c8eafb825 , < faeec8e23c10bd30e8aa759a2eb3018dae00f924 (git)
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    Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.7 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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