NetSight
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high7.8

CVE-2023-4623

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 esc…

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 2.6.12 before 4.14.327
from 4.15 before 4.19.295
from 4.20 before 5.4.257
from 5.5 before 5.10.195
from 5.11 before 5.15.132
from 5.16 before 6.1.53
DebianDebian Linux
Version 10.0

Weakness classification

CWE-416

References