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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-37890 Detail

Description

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/


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547 kernel.org Patch 
https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421 kernel.org Patch 
https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202 kernel.org Patch 
https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21 kernel.org Patch 
https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef kernel.org Patch 
https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5 kernel.org Patch 
https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0 kernel.org Patch 
https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0 kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html CVE Mailing List 
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html CVE Mailing List 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-37890
NVD Published Date:
05/16/2025
NVD Last Modified:
11/17/2025
Source:
kernel.org