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CVE-2021-4090

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，攻击者可以通过 nfsd4_decode_bitmap() 触发 Linux 内核的缓冲区溢出，以触发拒绝服务，并可能运行代码。

AI Predicted 4.7 Difficulty: Moderate EPSS 0.34% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
Linux kernel 5.11< 5.15.5 affected
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I. Basic Information for CVE-2021-4090

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，攻击者可以通过 nfsd4_decode_bitmap() 触发 Linux 内核的缓冲区溢出，以触发拒绝服务，并可能运行代码。
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 5.11 ~ 5.15.5 -

II. Public POCs for CVE-2021-4090

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III. Intelligence Information for CVE-2021-4090

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Patches & Fixes for CVE-2021-4090 (1)

Vendor Advisories for CVE-2021-4090 (2)

Other References for CVE-2021-4090 (1)

IV. Related Vulnerabilities

Same product: kernel
Same vendor: Linux
Same weakness: CWE-787

V. Comments for CVE-2021-4090

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