Use After Free Affecting kernel-rt-modules-partner package, versions *


Severity

Recommended
medium

Based on CentOS security rating.

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  • Snyk IDSNYK-CENTOS9-KERNELRTMODULESPARTNER-9134871
  • published5 Mar 2025
  • disclosed27 Feb 2025

Introduced: 27 Feb 2025

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

How to fix?

There is no fixed version for Centos:9 kernel-rt-modules-partner.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-partner package and not the kernel-rt-modules-partner package as distributed by Centos. See How to fix? for Centos:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1