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I. Basic Information for CVE-2025-21666
Vulnerability Information

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Vulnerability Title
vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't. Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning. This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems.
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 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。 Linux kernel存在代码问题漏洞,该漏洞源于vsock_*[has_data|has_space]函数在套接字未分配传输层时被调用,可能导致空指针引用。虽然之前的修复解决了部分问题,但未来仍可能遇到类似情况,因此需要在函数中添加额外检查以避免崩溃。
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 c0cfa2d8a788fcf45df5bf4070ab2474c88d543a ~ daeac89cdb03d30028186f5ff7dc26ec8fa843e7 -
LinuxLinux 5.5 -
II. Public POCs for CVE-2025-21666
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III. Intelligence Information for CVE-2025-21666
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IV. Related Vulnerabilities
V. Comments for CVE-2025-21666

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