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CVE-2026-21242 is a use-after-free vulnerability in Windows Subsystem for Linux (WSL). The flaw allows an authorized local attacker to trigger memory corruption in WSL after an object has been freed and subsequently reused. Successful exploitation can result in elevation of privilege on the affected Windows host.
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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.
A privilege escalation vulnerability affecting Windows Subsystem for Linux (WSL).
An elevation of privilege vulnerability in Windows Subsystem for Linux (no additional details provided in the content).
An elevation of privilege vulnerability in Windows Subsystem for Linux (WSL).
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.