CVE-2025-21726 - Linux Kernel padata Reorder Work Use-After-Free Vulnerability

CVE-2025-21726 - Linux Kernel padata Reorder Work Use-After-Free Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Thu, 02/27/2025 - 03:47
CVE ID : CVE-2025-21726
Published : Feb. 27, 2025, 2:15 a.m. | 32 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: padata: avoid UAF for reorder_work Although the previous patch can avoid ps and ps UAF for _do_serial, it can not avoid potential UAF issue for reorder_work. This issue can happen just as below: crypto_request crypto_request crypto_del_alg padata_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 pd invoke_padata_reorder // UAF of pd To 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.
Severity: 0.0 | NA
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