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Review reviewHigh

CVE-2025-38350

Linux Linux, RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family

In the Linux kernel, the following vulnerability has been resolved: net/sched: Always pass notifications when child class becomes empty Certain classful qdiscs may invoke their classes' dequeue handler on an enqueue operation. This may unexpectedly empty the child qdisc and thus make an in-flight class passive via qlen_notify(). Most qdiscs do not expect such behaviour at this point in time and may re-activate the class eventually anyways which will lead to a use-after-free. The referenced fix commit attempted to fix this behavior for the HFSC case by moving the backlog accounting around, t...

CVSS
7.8
EPSS
0.18%
7.81% percentile
CISA KEV
Not listed
Published
2025.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.18%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/sched: Always pass notifications when child class becomes empty Certain classful qdiscs may invoke their classes' dequeue handler on an enqueue operation. This may unexpectedly empty the child qdisc and thus make an in-flight class passive via qlen_notify(). Most qdiscs do not expect such behaviour at this point in time and may re-activate the class eventually anyways which will lead to a use-after-free. The referenced fix commit attempted to fix this behavior for the HFSC case by moving the backlog accounting around, t...

Affected product and versions

Product
Linux Linux, RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Affected versions
>= 1034e3310752e8675e313f7271b348914008719a < 3b290923ad2b23596208c1e29520badef4356a43, >= f9f593e34d2fb67644372c8f7b033bdc622ad228 < e9921b57dca05ac5f4fa1fa8e993d4f0ee52e2b7, >= 89c301e929a0db14ebd94b4d97764ce1d6981653 < e269f29e9395527bc00c213c6b15da04ebb35070, >= f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 < 7874c9c132e906a52a187d045995b115973c93fb, >= 93c276942e75de0e5bc91576300d292e968f5a02 < f680a4643c6f71e758d8fe0431a958e9a6a4f59d, >= 49b21795b8e5654a7df3d910a12e1060da4c04cf < a553afd91f55ff39b1e8a1c4989a29394c9e0472, >= 3f981138109f63232a5fb7165938d4c945cc1b9d < a44acdd9e84a211989ff4b9b92bf3545d8456ad5, >= 3f981138109f63232a5fb7165938d4c945cc1b9d < 103406b38c600fec1fe375a77b27d87e314aea09, >= 3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335, >= 5.4.294 < 5.4.296, >= 5.10.238 < 5.10.240, >= 5.15.185 < 5.15.187, >= 6.1.141 < 6.1.144, >= 6.6.93 < 6.6.97, >= 6.12.31 < 6.12.37, >= 6.14.9 < 6.15, >= 6.15, < V3.3, >= V3.1.5, >= 6.15.1 < 6.15.6
Fixed versions
5.4.296, 5.10.240, 5.15.187, 6.1.144, 6.6.97, 6.12.37, 6.15, 6.15.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416