UBUNTU-CVE-2024-57881
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.
02 / AFFECTED SOFTWARE
Affected packages
16 explicit affected versions
29 explicit affected versions
10 explicit affected versions
11 explicit affected versions
9 explicit affected versions
13 explicit affected versions
1 explicit affected versions
7 explicit affected versions
26 explicit affected versions
37 explicit affected versions
10 explicit affected versions
10 explicit affected versions
13 explicit affected versions
13 explicit affected versions
78 explicit affected versions
7 explicit affected versions
45 explicit affected versions
37 explicit affected versions
8 explicit affected versions
4 explicit affected versions
8 explicit affected versions
19 explicit affected versions
23 explicit affected versions
7 explicit affected versions
10 explicit affected versions
33 explicit affected versions
2 explicit affected versions
12 explicit affected versions
38 explicit affected versions
51 explicit affected versions
13 explicit affected versions
10 explicit affected versions
10 explicit affected versions
13 explicit affected versions
1 explicit affected versions
10 explicit affected versions
10 explicit affected versions
1 explicit affected versions
8 explicit affected versions
13 explicit affected versions
21 explicit affected versions
6 explicit affected versions
26 explicit affected versions
13 explicit affected versions
12 explicit affected versions
7 explicit affected versions
14 explicit affected versions
12 explicit affected versions
26 explicit affected versions
23 explicit affected versions
14 explicit affected versions
5 explicit affected versions
3 explicit affected versions
12 explicit affected versions
44 explicit affected versions
4 explicit affected versions
4 explicit affected versions
13 explicit affected versions
16 explicit affected versions
9 explicit affected versions
12 explicit affected versions
13 explicit affected versions
7 explicit affected versions
10 explicit affected versions
14 explicit affected versions
18 explicit affected versions
3 explicit affected versions
16 explicit affected versions
6 explicit affected versions
43 explicit affected versions
11 explicit affected versions
35 explicit affected versions
12 explicit affected versions
13 explicit affected versions
12 explicit affected versions
50 explicit affected versions
11 explicit affected versions
12 explicit affected versions
27 explicit affected versions
12 explicit affected versions
7 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/faeec8e23c10bd30e8aa759a2eb3018dae00f924
- https://git.kernel.org/stable/c/4234ca9884bcae9e48ed38652d91696ad5cd591d
- https://git.kernel.org/stable/c/faeec8e23c10bd30e8aa759a2eb3018dae00f924
- https://ubuntu.com/security/CVE-2024-57881
- https://ubuntu.com/security/notices/USN-7379-1
- https://ubuntu.com/security/notices/USN-7379-2
- https://ubuntu.com/security/notices/USN-7380-1
- https://ubuntu.com/security/notices/USN-7381-1
- https://ubuntu.com/security/notices/USN-7382-1
- https://www.cve.org/CVERecord?id=CVE-2024-57881