CVE-2025-37914
net_sched: ets: Fix double list add in class with netem as child qdisc
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net_sched: ets: Fix double list add in class with netem as child qdisc
In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: 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 ets, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. In addition to checking for qlen being zero, this patch checks whether the class was already added to the 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/
Reserved 2025-04-16 | Published 2025-05-20 | Updated 2025-05-29 | Assigner Linuxgit.kernel.org/...c/554acc5a2ea9703e08023eb9a003f9e5a830a502
git.kernel.org/...c/9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990
git.kernel.org/...c/72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3
git.kernel.org/...c/1f01e9f961605eb397c6ecd1d7b0233dfbf9077c
git.kernel.org/...c/bc321f714de693aae06e3786f88df2975376d996
git.kernel.org/...c/1a6d0c00fa07972384b0c308c72db091d49988b6
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