CVE-2023-4208— Use-after-free in Linux kernel's net/sched: cls_u32 component
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I. Basic Information for CVE-2023-4208
Vulnerability Information
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Vulnerability Title
Use-after-free in Linux kernel's net/sched: cls_u32 component
Source: NVD (National Vulnerability Database)
Vulnerability 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. We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。攻击者利用该漏洞可以提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2023-4208
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Same Patch Batch · Linux · 2023-09-06 · 8 CVEs total
| CVE-2023-4623 | 7.8 HIGH | Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) componen |
| CVE-2023-4622 | 7.8 HIGH | Use-after-free in Linux kernel's af_unix component |
| CVE-2023-4244 | 7.8 HIGH | Use-after-free in Linux kernel's netfilter: nf_tables component |
| CVE-2023-4207 | 7.8 HIGH | Use-after-free in Linux kernel's net/sched: cls_fw component |
| CVE-2023-4206 | 7.8 HIGH | Use-after-free in Linux kernel's net/sched: cls_route component |
| CVE-2023-4015 | 7.8 HIGH | Use-after-free in Linux kernel's netfilter: nf_tables component |
| CVE-2023-3777 | 7.8 HIGH | Use-after-free in Linux kernel's netfilter: nf_tables component |
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V. Comments for CVE-2023-4208
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