CVE-2024-53057

Summary

CVE-2024-53057 is a vulnerability affecting the Linux kernel. In the net/sched module, the assumption that Qdiscs with major handle ffff: are always root or ingress is incorrect. This assumption can lead to a Use-After-Free (UAF) issue in qdisc_tree_reduce_backlog when dealing with egress qdiscs that have a major handle of ffff:. The proper fix is to stop the iteration when the parent is TC_H_ROOT, as only the root Qdisc can have an ingress Qdisc without a major handle check. This issue can be exploited to cause unintended behavior or crashes, and patches have been released to address it. The affected file is sch_api.c, with two changes made, including one insertion and one deletion.

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