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CVE-2021-4095

Quick assessment

Affected
n/a 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。KVM是其中的一个基于内核的虚拟机。overlayfs是其中的一套文件系统。 Linux Kernel 存在代码问题漏洞，攻击者可利用该漏洞通过kvm脏环get()强制在Linux内核上解除对NULL指针的引用，以触发拒绝服务。

AI Predicted 5.5 Difficulty: Easy EPSS 0.39% · P30
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I. Basic Information for CVE-2021-4095

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions prior to 5.17-rc1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 代码问题漏洞
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。KVM是其中的一个基于内核的虚拟机。overlayfs是其中的一套文件系统。 Linux Kernel 存在代码问题漏洞，攻击者可利用该漏洞通过kvm脏环get()强制在Linux内核上解除对NULL指针的引用，以触发拒绝服务。
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
- kernel Linux kernel versions prior to 5.17-rc1 -

II. Public POCs for CVE-2021-4095

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III. Intelligence Information for CVE-2021-4095

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Vendor Advisories for CVE-2021-4095 (1)

Mailing List Discussions for CVE-2021-4095 (3)

Same Patch Batch · n/a · 2022-03-08 · 9 CVEs total

CVE-2022-0856 libcaca 数字错误漏洞
CVE-2021-3981 grub2 安全漏洞
CVE-2022-0516 Linux kernel 缓冲区错误漏洞
CVE-2021-3698 Cockpit 信任管理问题漏洞
CVE-2022-25225 Network Olympus SQL注入漏洞
CVE-2022-24286 Acer QuickAccess 授权问题漏洞
CVE-2022-24285 Acer Care Center 授权问题漏洞
CVE-2021-28488 Ericsson Network Manage安全漏洞

IV. Related Vulnerabilities

Same product: kernel
Same vendor: n/a
Same weakness: CWE-476

V. Comments for CVE-2021-4095

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