CVE-2024-41055

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.

• linux linux kernel (>= 5.10.219 < 5.10.222) • linux linux kernel (>= 5.15.149 < 5.15.163) • linux linux kernel (>= 6.1.76 < 6.1.100) • linux linux kernel (>= 6.6.15 < 6.6.41) • linux linux kernel (>= 6.8 < 6.9.10)