kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue()

A flaw was found in the HFSC queueing discipline implementation in the Linux kernel. When a packet is enqueued and the child qdisc's peek function is called before properly updating the HFSC queue's length and backlog counters, a race condition can occur. In some cases, the peek operation may...

DEBIAN-CVE-2023-4623

A use-after-free vulnerability in the Linux kernel's net/sched: schhfsc HFSC qdisc traffic control component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve i.e. with the HFSCFSC flag set has a parent without a link-sharing curve, then initvf will call...