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CVE-2023-3812— Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
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TUN/TAP设备驱动程序存在越界内存访问漏洞。

CVSS 7.8 · High EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2023-3812

Vulnerability Information
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Vulnerability Title
Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds memory access flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate their privileges on the system.
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TUN/TAP设备驱动程序存在越界内存访问漏洞。
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 8 0:4.18.0-513.9.1.rt7.311.el8_9 ~ * cpe:/a:redhat:enterprise_linux:8::nfv
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.9.1.el8_9 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions - cpe:/o:redhat:rhel_e4s:8.1::baseos
Red Hat Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions 0:4.18.0-147.94.1.el8_1 ~ * cpe:/o:redhat:rhel_e4s:8.1::baseos
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:4.18.0-193.133.1.el8_2 ~ * cpe:/o:redhat:rhel_e4s:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service 0:4.18.0-193.133.1.rt13.184.el8_2 ~ * cpe:/a:redhat:rhel_tus:8.2::realtime
Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service 0:4.18.0-193.133.1.el8_2 ~ * cpe:/o:redhat:rhel_e4s:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions - cpe:/o:redhat:rhel_e4s:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions 0:4.18.0-193.133.1.el8_2 ~ * cpe:/o:redhat:rhel_e4s:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.18.0-305.120.1.el8_4 ~ * cpe:/o:redhat:rhel_tus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:4.18.0-305.120.1.rt7.196.el8_4 ~ * cpe:/a:redhat:rhel_tus:8.4::nfv
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:4.18.0-305.120.1.el8_4 ~ * cpe:/o:redhat:rhel_tus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 0:4.18.0-305.120.1.el8_4 ~ * cpe:/o:redhat:rhel_tus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions - cpe:/o:redhat:rhel_e4s:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support - cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.18.0-372.87.1.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support - cpe:/o:redhat:rhel_eus:8.8::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.18.0-477.43.1.el8_8 ~ * cpe:/a:redhat:rhel_eus:8.8::crb
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.18.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::realtime
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.18.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::realtime
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:5.14.0-70.80.1.el9_0 ~ * cpe:/o:redhat:rhel_eus:9.0::baseos
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:5.14.0-70.80.1.rt21.151.el9_0 ~ * cpe:/a:redhat:rhel_eus:9.0::realtime
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support - cpe:/o:redhat:rhel_eus:9.0::baseos
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.40.1.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::crb
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.40.1.rt14.325.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::realtime
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support - cpe:/o:redhat:rhel_eus:9.2::baseos
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.18.0-372.87.1.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6

II. Public POCs for CVE-2023-3812

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III. Intelligence Information for CVE-2023-3812

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Patches & Fixes for CVE-2023-3812 (1)

Vendor Advisories for CVE-2023-3812 (25)

Same Patch Batch · Red Hat · 2023-07-24 · 10 CVEs total

CVE-2023-38200 7.5 HIGH Keylime: registrar is subject to a dos against ssl connections
CVE-2023-3567 7.1 HIGH Kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race
CVE-2023-3640 7.0 HIGH Kernel: x86/mm: a per-cpu entry area leak was identified through the init_cea_offsets func
CVE-2023-33952 6.7 MEDIUM Kernel: vmwgfx: double free within the handling of vmw_buffer_object objects
CVE-2023-33951 6.7 MEDIUM Kernel: vmwgfx: race condition leading to information disclosure vulnerability
CVE-2023-3750 6.5 MEDIUM Libvirt: improper locking in virstoragepoolobjlistsearch may lead to denial of service
CVE-2023-3019 6.0 MEDIUM Qemu: e1000e: heap use-after-free in e1000e_write_packet_to_guest()
CVE-2023-3745 5.5 MEDIUM Imagemagick: heap-buffer-overflow in pushcharpixel() in quantum-private.h
CVE-2023-3384 5.4 MEDIUM Quay: stored cross site scripting

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-787

V. Comments for CVE-2023-3812

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