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CVE-2023-52622 is an availability flaw in the Linux kernel ext4 online-resize implementation. When an ext4 filesystem configured with an oversized flexible block-group size is expanded online, ext4 can calculate and allocate a new_group_data array larger than the kernel page allocator's MAX_ORDER limit. The failed oversized allocation triggers a WARN_ON in __alloc_pages during ext4_resize_fs, causing the online resize operation to fail. The upstream fix defines a maximum of 16,384 groups per resize iteration and completes larger expansions over multiple iterations.
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Linux kernel ext4 online-resize failure associated with oversized flex block groups.
Linux kernel ext4 flaw involving online resize failures caused by an oversized flex block group.
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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.
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