CVE-2025-37890 - Linux Kernel net_sched hfsc UAF Vulnerability

CVE-2025-37890 - Linux Kernel net_sched hfsc UAF Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Fri, 05/16/2025 - 17:40
CVE ID : CVE-2025-37890
Published : May 16, 2025, 1:15 p.m. | 55 minutes ago
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/
Severity: 0.0 | NA
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