Use After Free Affecting bpftool-debuginfo package, versions <0:6.1.131-143.221.amzn2023


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-AMZN2023-BPFTOOLDEBUGINFO-9598303
  • published2 Apr 2025
  • disclosed27 Feb 2025

Introduced: 27 Feb 2025

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

How to fix?

Upgrade Amazon-Linux:2023 bpftool-debuginfo to version 0:6.1.131-143.221.amzn2023 or higher.
This issue was patched in ALAS2023-2025-915.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bpftool-debuginfo package and not the bpftool-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 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-&gt;work)

...

            &lt;kworker context&gt;
            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