CVE-2025-21726: padata: avoid UAF for reorder_work
First published: Thu Feb 27 2025(Updated: )
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) ... <kworker context> padata_serial_worker // completes new request, // no more outstanding // requests crypto_del_alg // free pd <kworker context> 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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.4.19<5.5 | |
| Linux Kernel | >=5.5.3<5.10.235 | |
| Linux Kernel | >=5.11<5.15.79 | |
| Linux Kernel | >=5.16<6.1.129 | |
| Linux Kernel | >=6.2<6.6.76 | |
| Linux Kernel | >=6.7<6.12.13 | |
| Linux Kernel | >=6.13<6.13.2 |
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Reference Links
- https://git.kernel.org/stable/c/6f45ef616775b0ce7889b0f6077fc8d681ab30bc
- https://git.kernel.org/stable/c/7000507bb0d2ceb545c0a690e0c707c897d102c2
- https://git.kernel.org/stable/c/8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac
- https://git.kernel.org/stable/c/a54091c24220a4cd847d5b4f36d678edacddbaf0
- https://git.kernel.org/stable/c/dd7d37ccf6b11f3d95e797ebe4e9e886d0332600
- https://git.kernel.org/stable/c/f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0
- https://git.kernel.org/stable/c/4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1
Frequently Asked Questions
What is the severity of CVE-2025-21726?
CVE-2025-21726 has a medium severity rating due to its potential to cause a use-after-free condition in the Linux kernel.
How do I fix CVE-2025-21726?
To fix CVE-2025-21726, ensure that you update to the latest version of the Linux kernel that includes the relevant patches.
What systems are affected by CVE-2025-21726?
CVE-2025-21726 affects all versions of the Linux kernel prior to the patched releases.
What type of vulnerability is CVE-2025-21726?
CVE-2025-21726 is a use-after-free vulnerability in the padata subsystem of the Linux kernel.
What could happen if CVE-2025-21726 is exploited?
Exploitation of CVE-2025-21726 could potentially lead to arbitrary code execution or a system crash.
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