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CVE-2025-21090 is a local denial-of-service vulnerability affecting some Intel Xeon processors. Intel describes the issue as a "missing reference to active allocated resource," indicating improper handling of references to resources that remain active/allocated. An authenticated local user may be able to trigger this condition and cause denial of service on affected systems. Reported affected products include 4th Gen Intel Xeon Scalable processors, 5th Gen Intel Xeon Scalable processors, Intel Xeon W2400/W3400 processors, and Intel Xeon 6 processor family products.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local vulnerability in Intel Xeon processor firmware (per INTEL-SA-01313) impacting certain HPE SimpliVity servers, potentially enabling escalation of privilege and/or denial of service.
A medium-severity local denial of service vulnerability in some Intel Xeon processors caused by a missing reference to an active allocated resource.
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.