TopVuln

Details

CVSS v3

7.8

NVD published

2025-05-16 13:15:52

EPSS

<0.1% probability · 24.1th percentile — 2026-04-22

Affected versions

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:rc7:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.0:rc8:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

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/

Remediation

Not available in our cache.

Exploit info

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