Loading vulnerability…
CVE-2025-21863 is a speculative-execution vulnerability in the Linux kernel io_uring subsystem. The submission queue entry field sqe->opcode is used to index different opcode tables without sufficient sanitization against speculative execution. Speculative use of an invalid or attacker-controlled opcode could cause unintended kernel behavior or potentially disclose information. The fix sanitizes sqe->opcode before opcode table indexing.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel io_uring vulnerability involving insufficient sanitization of sqe->opcode against speculative execution when indexing different tables. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required and potentially high confidentiality, integrity, and availability impacts. The recommended fix is to update the Echo linux package and related packages to version 6.1.176-1 or later.
A Linux kernel io_uring vulnerability involving insufficient sanitization of sqe->opcode against speculative execution when indexing different tables. The advisory identifies affected Google Container-Optimized OS kernel packages and assigns a CVSS v3 base score of 7.8, with local access and low privileges required. The stated fix is to update sys-kernel/lakitu-kernel-6_1 and related packages to version 18613.164.81 or later.
Linux kernel io_uring opcode speculation flaw.
A Linux kernel io_uring vulnerability addressed by preventing opcode speculation.
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.