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CVE-2023-3609— Use-after-free in Linux kernel's net/sched: cls_u32 component

Quick assessment

Affected
Linux Kernel
Exploitation
Public or AI PoC available; prioritize validation
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。攻击者利用该漏洞可以升级本地权限。

CVSS 7.8 · High EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 9

VendorProduct Version RangeStatus
Linux Kernel 4.14.0< 4.14.322 affected
4.15.0< 4.19.291 affected
4.20.0< 5.4.248 affected
5.5.0< 5.10.185 affected
5.11.0< 5.15.118 affected
5.16.0< 6.1.35 affected
6.2.0< 6.3.9 affected
6.4.0 unaffected
… +1 more rows
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I. Basic Information for CVE-2023-3609

Vulnerability Information
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Vulnerability Title
Use-after-free in Linux kernel's net/sched: cls_u32 component
Source: CVE Program / CVE List V5
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. If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.
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。攻击者利用该漏洞可以升级本地权限。
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 4.14.0 ~ 4.14.322 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2023-3609

# POC Description Source Link Shenlong Link
1 None https://github.com/Jturnxd/CVE-2023-3609 POC Details
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III. Intelligence Information for CVE-2023-3609

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Patches & Fixes for CVE-2023-3609 (1)

Vendor Advisories for CVE-2023-3609 (2)

Exploits & Public PoCs for CVE-2023-3609 (2)

Mailing List Discussions for CVE-2023-3609 (2)

Other References for CVE-2023-3609 (1)

Same Patch Batch · Linux · 2023-07-21 · 4 CVEs total

CVE-2023-3776 7.8 HIGH Use-after-free in Linux kernel's net/sched: cls_fw component
CVE-2023-3611 7.8 HIGH Out-of-bounds write in Linux kernel's net/sched: sch_qfq component
CVE-2023-3610 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-2023-3609

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