NetSight
IP …
high7.8

CVE-2023-4207

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

Impact

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 3.18 before 4.14.326
from 4.15 before 4.19.295
from 4.20 before 5.4.253
from 5.5 before 5.10.190
from 5.11 before 5.15.126
from 5.16 before 6.1.45
DebianDebian Linux
Version 12.0

Weakness classification

CWE-416

References