PT-2023-4878 · Linux+6 · Linux Kernel+6
Bing-Jhong Billy Jheng
+1
·
Published
2023-07-29
·
Updated
2025-09-26
·
CVE-2023-4207
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
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.Recommendations
Upgrade past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.
Exploit
Fix
LPE
Use After Free
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Linux Kernel
Red Hat
Red Os