Missing Release of Resource after Effective Lifetime Affecting python3-perf6.12-debuginfo package, versions <1:6.12.63-84.121.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.39% (32nd percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON3PERF612DEBUGINFO-15319201
  • published19 Feb 2026
  • disclosed24 Nov 2025

Introduced: 24 Nov 2025

CVE-2025-40212  (opens in a new tab)
CWE-772  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3-perf6.12-debuginfo to version 1:6.12.63-84.121.amzn2023 or higher.
This issue was patched in ALAS2023-2026-1430.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-perf6.12-debuginfo package and not the python3-perf6.12-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:

nfsd: fix refcount leak in nfsd_set_fh_dentry()

nfsd exports a "pseudo root filesystem" which is used by NFSv4 to find the various exported filesystems using LOOKUP requests from a known root filehandle. NFSv3 uses the MOUNT protocol to find those exported filesystems and so is not given access to the pseudo root filesystem.

If a v3 (or v2) client uses a filehandle from that filesystem, nfsd_set_fh_dentry() will report an error, but still stores the export in "struct svc_fh" even though it also drops the reference (exp_put()). This means that when fh_put() is called an extra reference will be dropped which can lead to use-after-free and possible denial of service.

Normal NFS usage will not provide a pseudo-root filehandle to a v3 client. This bug can only be triggered by the client synthesising an incorrect filehandle.

To fix this we move the assignments to the svc_fh later, after all possible error cases have been detected.

CVSS Base Scores

version 3.1