Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject short READ responses in CIFSSMBRead() CIFSSMBRead() reads DataLengthHigh, DataLength and DataOffset out of the READ_RSP returned by the server without first checking that a whole READ_RSP was actually received. The length of the response is recorded in rsp_iov.iov_len, but nothing constrains it to be at least read_rsp_size before those fields are dereferenced. A malicious or compromised SMB1 server can return a response shorter than the READ_RSP header, so that parsing the header itself reads past the end of the receive buffer. SMB1 is not negotiated by default; reaching this code requires an explicit vers=1.0 mount. Reject the response unless it is at least read_rsp_size bytes long.
References
- https://git.kernel.org/stable/c/0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd
- https://git.kernel.org/stable/c/aaa221c1b1d288845b55e9c366e5ef608dfff49d
- https://git.kernel.org/stable/c/e6142a8bfc230c7263eb8b0475249c958ce49367
FAQ
What is CVE-2026-97565?
CVE-2026-97565 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: smb: client: reject short READ responses in CIFSSMBRead() CIFSSMBRead() reads DataLengthHigh, DataLength and DataOffset out of the...
How severe is CVE-2026-97565?
CVSS scoring is not yet available for CVE-2026-97565. Check NVD for updates.
Is there a patch for CVE-2026-97565?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.