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CVE-2025-21863 is a speculative-execution vulnerability in the Linux kernel io_uring subsystem. The submission queue entry opcode is used to index different internal tables without sanitization against speculative execution. A mispredicted execution path could transiently use an attacker-controlled or otherwise invalid opcode value for a table access. The upstream fix sanitizes the opcode before it is used.
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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.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel io_uring vulnerability addressed by preventing opcode speculation.
Linux kernel io_uring opcode speculative-execution vulnerability.
A Linux kernel io_uring vulnerability in which the sqe->opcode value could be speculatively used for different tables without appropriate sanitization.
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.