smb: client: reject short READ responses in CIFSSMBRead() (CVE-2026-97565) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97565

smb: client: reject short READ responses in CIFSSMBRead()

Answer in brief

CVE-2026-97565 records a Unknown severity vulnerability in smb: client: reject short READ responses in CIFSSMBRead(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aaa221c1b1d288845b55e9c366e5ef608dfff49d \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6142a8bfc230c7263eb8b0475249c958ce49367	0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd, aaa221c1b1d288845b55e9c366e5ef608dfff49d, e6142a8bfc230c7263eb8b0475249c958ce49367
Linux/Linuxgeneric	2.6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.