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CVE-2023-52489 is a race condition in the Linux kernel sparse memory subsystem affecting access to memory_section->usage. During memory compaction, pfn_valid() and pfn_section_valid() can validate and access usage metadata for a ZONE_DEVICE page frame number while another CPU concurrently deactivates and removes that memory section. Section deactivation can free the usage allocation and set its pointer to NULL, allowing the compaction path to dereference NULL in __pageblock_pfn_to_page. The issue affects configurations using CONFIG_SPARSEMEM_VMEMAP and was introduced in Linux kernel 5.3.
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Linux kernel sparse memory subsystem race condition.
Linux kernel sparse-memory race condition involving access to memory_section->usage.
Linux kernel sparse-memory race condition involving memory_section usage access.
Linux kernel sparse-memory memory-section access race vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.