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CVE-2023-6535— Kernel: null pointer dereference in nvmet_tcp_execute_request

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，该漏洞源于可能允许未经身份验证的攻击者发送精心设计的TCP数据包，导致NULL指针取消引用和拒绝服务。

CVSS 6.5 · Medium EPSS 1.55% · P74

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-6535

Vulnerability Information
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Vulnerability Title
Kernel: null pointer dereference in nvmet_tcp_execute_request
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Linux kernel's NVMe driver. This issue may allow an unauthenticated malicious actor to send a set of crafted TCP packages when using NVMe over TCP, leading the NVMe driver to a NULL pointer dereference in the NVMe driver, causing kernel panic and a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
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，该漏洞源于可能允许未经身份验证的攻击者发送精心设计的TCP数据包，导致NULL指针取消引用和拒绝服务。
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 0:4.18.0-513.18.1.rt7.320.el8_9 ~ * cpe:/a:redhat:enterprise_linux:8::realtime
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.18.1.el8_9 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.18.0-372.91.1.el8_6 ~ * cpe:/a:redhat:rhel_eus:8.6::crb
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.18.0-477.58.1.el8_8 ~ * cpe:/a:redhat:rhel_eus:8.8::crb
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.24.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.24.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.52.1.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::crb
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.52.1.rt14.337.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::realtime
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.18.0-372.91.1.el8_6 ~ * cpe:/a:redhat:rhel_eus:8.6::crb
Red Hat RHOL-5.8-RHEL-9 v5.8.6-22 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-11 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v6.8.1-407 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-19 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v1.0.0-479 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-7 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v0.4.0-247 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-5 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v1.1.0-227 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.1-470 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v2.9.6-14 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-2 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-24 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v5.8.6-10 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v0.1.0-525 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v0.1.0-224 ~ * cpe:/a:redhat:logging:5.8::el9
Red Hat RHOL-5.8-RHEL-9 v0.28.1-56 ~ * cpe:/a:redhat:logging:5.8::el9
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 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2023-6535

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III. Intelligence Information for CVE-2023-6535

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Vendor Advisories for CVE-2023-6535 (11)

Mailing List Discussions for CVE-2023-6535 (1)

Same Patch Batch · Red Hat · 2024-02-07 · 3 CVEs total

CVE-2023-6536 6.5 MEDIUM Kernel: null pointer dereference in __nvmet_req_complete
CVE-2023-6356 6.5 MEDIUM Kernel: null pointer dereference in nvmet_tcp_build_iovec

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-476

V. Comments for CVE-2023-6535

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