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Use After Free The advisory has been revoked - it doesn't affect any version of package kernel-64k-modules-partner  (opens in a new tab)

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EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-RHEL9-KERNEL64KMODULESPARTNER-9134995
  • published5 Mar 2025
  • disclosed27 Feb 2025
Report a new vulnerability Found a mistake?

Introduced: 27 Feb 2025

CVE-2025-21726  (opens in a new tab)
CWE-416  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules-partner package and not the kernel-64k-modules-partner package as distributed by RHEL.

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.