CVE-2025-21726

Summary

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.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
• https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html

Additional References

• https://cert-portal.siemens.com/productcert/html/ssa-265688.html

References

• https://git.kernel.org/stable/c/f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0
• https://git.kernel.org/stable/c/4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1
• https://git.kernel.org/stable/c/7000507bb0d2ceb545c0a690e0c707c897d102c2
• https://git.kernel.org/stable/c/6f45ef616775b0ce7889b0f6077fc8d681ab30bc
• https://git.kernel.org/stable/c/8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac
• https://git.kernel.org/stable/c/a54091c24220a4cd847d5b4f36d678edacddbaf0
• https://git.kernel.org/stable/c/dd7d37ccf6b11f3d95e797ebe4e9e886d0332600

• ←Previous
• Next→