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prionPRIOn knowledge basePRION:CVE-2023-4623
HistorySep 06, 2023 - 2:15 p.m.

Design/Logic Flaw

2023-09-0614:15:00
PRIOn knowledge base
www.prio-n.com
14
linux kernel
use-after-free
vulnerability
local privilege escalation
traffic control

AI Score

7.3

Confidence

High

EPSS

0

Percentile

5.1%

A use-after-free vulnerability in the Linux kernel’s net/sched: sch_hfsc (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 HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.

We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.