CVE-2025-37890 Affecting kernel-tools-libs package, versions <0:5.14.0-570.32.1.el9_6


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.05% (17th percentile)

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  • Snyk IDSNYK-ALMALINUX9-KERNELTOOLSLIBS-11509524
  • published8 Aug 2025
  • disclosed4 Aug 2025

Introduced: 4 Aug 2025

NewCVE-2025-37890  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 kernel-tools-libs to version 0:5.14.0-570.32.1.el9_6 or higher.
This issue was patched in ALSA-2025:12746.

NVD Description

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

In the Linux kernel, the following vulnerability has been resolved:

net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case).

This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

CVSS Base Scores

version 3.1