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CVE-2026-62426 is a denial-of-service vulnerability in Xen's sysctl management path. Xen uses sysctl operations for privileged system management by the control domain or a possible Xenstore domain, and some of these operations are protected by a system-wide lock because they must not execute in parallel. The vulnerability arises because the sysctl lock acquisition mechanism does not provide fairness, allowing lock starvation or prolonged contention. In configurations using XSM/Flask, some affected operations may acquire the lock before permission checks are performed, which can let a less privileged entity interfere with access to the lock even before authorization is evaluated.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.