CVE-2026-89794
UnknownSummary
In the Linux kernel, ksmbd compound response handling extends the last response iov to an eight-byte boundary. smb2_read_pipe() allocates only the payload size, so the alignment padding can expose up to seven bytes of uninitialized kernel heap memory. The fix allocates the aligned size and clears the unused tail before pinning the response buffer.
Risk Assessment
Uninitialized kernel heap memory may leak to a remote SMB client. The leak may expose sensitive data or facilitate further attacks.
Recommendation
Update the Linux kernel to a version containing the fix that zeroes pipe read compound padding in ksmbd. Restrict access to the ksmbd service to trusted networks until patched.
Other vulnerabilities in Linux kernel
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- CVE-2026-100073Unknown
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- CVE-2026-100072Unknown
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: zero pipe read compound padding Compound response handling extends the last response iov to an eight-byte boundary. smb2_read_pipe() allocates only the payload size, so the alignment padding can expose up to seven bytes of uninitialized kernel heap memory. Allocate the aligned size and clear the unused tail before pinning the response buffer.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS