PT-2023-4897 · Linux+6 · Linux Kernel+6
M A Ramdhan
+1
·
Published
2023-07-29
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Updated
2024-10-08
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CVE-2023-4208
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 u32 component can be exploited to achieve local privilege escalation. When
u32 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 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81 to resolve the issue. As a temporary workaround, consider restricting access to the
net/sched: cls u32 component to minimize the risk of exploitation.Exploit
Fix
DoS
LPE
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Linux Kernel
Red Hat
Red Os