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CVE-2023-3777— Use-after-free in Linux kernel's netfilter: nf_tables 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 netfilter 子系统在某些情况下无法正确处理表规则刷新。

CVSS 7.8 · High EPSS 0.41% · P32

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2023-3777

Vulnerability Information
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Vulnerability Title
Use-after-free in Linux kernel's netfilter: nf_tables component
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. When nf_tables_delrule() is flushing table rules, it is not checked whether the chain is bound and the chain's owner rule can also release the objects in certain circumstances. We recommend upgrading past commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8.
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 netfilter 子系统在某些情况下无法正确处理表规则刷新。
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 5.9 ~ 6.5 -

II. Public POCs for CVE-2023-3777

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III. Intelligence Information for CVE-2023-3777

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Patches & Fixes for CVE-2023-3777 (1)

Vendor Advisories for CVE-2023-3777 (1)

Exploits & Public PoCs for CVE-2023-3777 (2)

Other References for CVE-2023-3777 (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-2023-4207 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

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-3777

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