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CVE-2025-21786 is a use-after-free vulnerability in the Linux kernel workqueue subsystem. A change that reaped normal workers using kthread_stop() did not correctly handle rescuer workers and removed waiting logic from put_unbound_pool(). Consequently, the pool workqueue (pwq) reference could be released before rescuer detachment from its worker pool had completed, allowing subsequent operations to access freed pool state. The corrective change defers release of the pwq reference until after the rescuer has detached from the pool.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel workqueue vulnerability related to improper handling of pwq after detaching the rescuer from the pool.
Linux kernel workqueue object-lifetime flaw.
A Linux kernel workqueue use-after-free vulnerability caused by incorrect reference handling while detaching a rescuer worker from its pool.
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.