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CVE-2023-3611— Out-of-bounds write in Linux kernel's net/sched: sch_qfq 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net/sched/sch_qfq.c中的qfq_change_agg()函数允许越界写入。攻击者利用该漏洞可以升级本地权限。

CVSS 7.8 · High EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2023-3611

Vulnerability Information
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Vulnerability Title
Out-of-bounds write in Linux kernel's net/sched: sch_qfq component
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds write vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. The qfq_change_agg() function in net/sched/sch_qfq.c allows an out-of-bounds write because lmax is updated according to packet sizes without bounds checks. We recommend upgrading past commit 3e337087c3b5805fe0b8a46ba622a962880b5d64.
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
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 缓冲区错误漏洞
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net/sched/sch_qfq.c中的qfq_change_agg()函数允许越界写入。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 3.8 ~ 6.5 -

II. Public POCs for CVE-2023-3611

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III. Intelligence Information for CVE-2023-3611

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Patches & Fixes for CVE-2023-3611 (1)

Vendor Advisories for CVE-2023-3611 (2)

Mailing List Discussions for CVE-2023-3611 (2)

Other References for CVE-2023-3611 (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-2023-3610 7.8 HIGH Use-after-free in Linux kernel's netfilter: nf_tables component
CVE-2023-3609 7.8 HIGH Use-after-free in Linux kernel's net/sched: cls_u32 component

IV. Related Vulnerabilities

Same product: Kernel
Same vendor: Linux
Same weakness: CWE-787

V. Comments for CVE-2023-3611

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