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Unrated severityNVD Advisory· Published Jul 29, 2024· Updated Nov 3, 2025

mm: prevent derefencing NULL ptr in pfn_section_valid()

CVE-2024-41055

Description

In the Linux kernel, the following vulnerability has been resolved:

mm: prevent derefencing NULL ptr in pfn_section_valid()

Commit 5ec8e8ea8b77 ("mm/sparsemem: fix race in accessing memory_section->usage") changed pfn_section_valid() to add a READ_ONCE() call around "ms->usage" to fix a race with section_deactivate() where ms->usage can be cleared. The READ_ONCE() call, by itself, is not enough to prevent NULL pointer dereference. We need to check its value before dereferencing it.

Affected products

126

Patches

6
797323d1cf92
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
941e81618566
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
bc17f2377818
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
0100aeb8a12d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
82f0b6f041fa
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
adccdf702b4e
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

6

News mentions

0

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