Red Hat: CVE-2024-41055: kernel: mm: prevent derefencing NULL ptr in pfn_section_valid() (Multiple Advisories)
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.
Solution(s)
- redhat-upgrade-kernel
- redhat-upgrade-kernel-rt
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