NetSight
IP …
high7.8

CVE-2025-37913

In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: Fix double list add in class with netem as child qdisc As described in Gerr…

Impact

In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 5.0.1 before 5.4.294
from 5.5 before 5.10.238
from 5.11 before 5.15.182
from 5.16 before 6.1.138
from 6.2 before 6.6.90
from 6.7 before 6.12.28
DebianDebian Linux
Version 11.0

Weakness classification

CWE-415

References