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CVE-2025-21726

Description

In the Linux kernel, the following vulnerability has been resolved:padata: avoid UAF for reorder_workAlthough the previous patch can avoid ps and ps UAF for _do_serial, itcan not avoid potential UAF issue for reorder_work. This issue canhappen just as below:crypto_request crypto_request crypto_del_algpadata_do_serial ... padata_reorder // processes all remaining // requests then breaks while (1) { if (!padata) break; ... } padata_do_serial // new request added list_add // sees the new request queue_work(reorder_work) padata_reorder queue_work_on(squeue->work)... padata_serial_worker // completes new request, // no more outstanding // requests crypto_del_alg // free pdinvoke_padata_reorder // UAF of pdTo avoid UAF for 'reorder_work', get 'pd' ref before put 'reorder_work'into the 'serial_wq' and put 'pd' ref until the 'serial_wq' finish.

POC

Reference

No PoCs from references.

Github

- https://github.com/runwhen-contrib/helm-charts

- https://github.com/w4zu/Debian_security