CVE-2025-37890 (GCVE-0-2025-37890)
Vulnerability from cvelistv5
Published
2025-05-16 13:01
Modified
2025-06-04 12:57
Severity ?
VLAI Severity ?
EPSS score ?
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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|
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{
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{
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{
"url": "https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202"
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"url": "https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5"
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"url": "https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547"
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"datePublished": "2025-05-16T13:01:12.798Z",
"dateReserved": "2025-04-16T04:51:23.963Z",
"dateUpdated": "2025-06-04T12:57:24.484Z",
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