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A race condition in the Linux kernel io_uring subsystem's uring_cmd handling allowed access to data in the original submission queue entry (SQE) after request preparation and outside the initial issue path. If an application reused that SQE before its original request completed, uring_cmd could read stale SQE data, resulting in data corruption. The intended correction unconditionally copies SQEs during request preparation. CVE-2025-21837 was subsequently rejected by the Linux kernel community.
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No public exploit code observed for this vulnerability.
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Linux kernel io_uring command SQE copy timing flaw.
Linux kernel io_uring command submission-entry handling flaw.
A rejected Linux kernel io_uring/uring_cmd data-corruption issue involving stale submission queue entry (SQE) data when an application reuses an SQE before the original command completes.
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.