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I. Basic Information for CVE-2026-23083
Vulnerability Information

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Vulnerability Title
fou: Don't allow 0 for FOU_ATTR_IPPROTO.
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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,该漏洞源于允许FOU_ATTR_IPPROTO设置为0,可能导致数据包未释放。
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
VendorProductAffected VersionsCPESubscribe
LinuxLinux 23461551c00628c3f3fe9cf837bf53cf8f212b63 ~ c7498f9bc390479ccfad7c7f2332237ff4945b03 -
LinuxLinux 3.18 -
II. Public POCs for CVE-2026-23083
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III. Intelligence Information for CVE-2026-23083
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IV. Related Vulnerabilities
V. Comments for CVE-2026-23083

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