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CVE-2023-4207— Use-after-free in Linux kernel's net/sched: cls_fw component

Quick assessment

Affected
Linux Kernel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.8 · High EPSS 0.32% · P22
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I. Basic Information for CVE-2023-4207

Vulnerability Information
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Vulnerability Title
Use-after-free in Linux kernel's net/sched: cls_fw component
Source: CVE Program / CVE List V5
Vulnerability 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. We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Kernel 3.18 ~ 6.5 -

II. Public POCs for CVE-2023-4207

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III. Intelligence Information for CVE-2023-4207

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Patches & Fixes for CVE-2023-4207 (1)

Vendor Advisories for CVE-2023-4207 (1)

Mailing List Discussions for CVE-2023-4207 (1)

Other References for CVE-2023-4207 (1)

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-2023-4208 7.8 HIGH Use-after-free in Linux kernel's net/sched: cls_u32 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

IV. Related Vulnerabilities

Same product: Kernel
Same vendor: Linux
Same weakness: CWE-416

V. Comments for CVE-2023-4207

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