CVE-2025-37890 (GCVE-0-2025-37890)
Vulnerability from cvelistv5
Published
2025-05-16 13:01
Modified
2026-08-05 11:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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/
References
Impacted products
Vendor Product Version
Linux Linux Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.