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CVE-2025-21837 was rejected or withdrawn by the Linux kernel CVE authority. The underlying Linux kernel io_uring uring_cmd defect involved retaining access to data in the original submission queue entry (SQE) after request preparation and beyond the initial issue path. If the submitting application reused that SQE before the associated request completed, uring_cmd could consume changed or stale SQE data. The upstream correction copies SQEs unconditionally during request preparation, preserving stable request data for later processing.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.