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CVE-2023-4194— Kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 9
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，该漏洞源于将套接字UID的下一个修复i_uid初始化为current_fsuid。

CVSS 5.5 · Medium EPSS 0.27% · P20
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I. Basic Information for CVE-2023-4194

Vulnerability Information
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Vulnerability Title
Kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
linux kernel 安全漏洞
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，该漏洞源于将套接字UID的下一个修复i_uid初始化为current_fsuid。
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
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.8.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::crb
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.8.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::crb
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Virtualization 4 - cpe:/o:redhat:rhev_hypervisor:4

II. Public POCs for CVE-2023-4194

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III. Intelligence Information for CVE-2023-4194

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Vendor Advisories for CVE-2023-4194 (6)

Mailing List Discussions for CVE-2023-4194 (3)

Other References for CVE-2023-4194 (3)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 9
Same vendor: Red Hat
Same weakness: CWE-843

V. Comments for CVE-2023-4194

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