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CVE-2023-52489 is a race condition in the Linux kernel sparse memory subsystem. With CONFIG_SPARSEMEM_VMEMAP enabled, memory compaction can inspect a device-memory PFN in a ZONE_NORMAL–ZONE_DEVICE–ZONE_NORMAL layout while another CPU deactivates and removes the corresponding ZONE_DEVICE memory section. The compaction path can pass valid_section() and subsequently access memory_section->usage after section deactivation has freed the allocation and set the pointer to NULL, resulting in a NULL-pointer dereference. The upstream fix clears SECTION_HAS_MEM_MAP before releasing usage metadata, places reader access in an RCU read-side critical section, and defers freeing the usage allocation with kfree_rcu().
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19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.