Answer in brief
CVE-2026-64395 records a Unknown severity vulnerability in ksmbd: require source read access for duplicate extents. 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.
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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=eb817368f50c1cbe1bd07044124aad7db6330e3a <2d2ab6983620c2d60ce7db72133984ca3873b929 || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <67bdad9cf01b25030e3bf00bbce6c309319d6663 || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <db231af842868268839f9f9619c68cb27830d8be || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <a10942af27832c2761d020863a46e79bebe0567d || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <cedff600f1642aa982178503552f0d007bc829c8 | 2d2ab6983620c2d60ce7db72133984ca3873b929, 67bdad9cf01b25030e3bf00bbce6c309319d6663, b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f, db231af842868268839f9f9619c68cb27830d8be, a10942af27832c2761d020863a46e79bebe0567d, cedff600f1642aa982178503552f0d007bc829c8 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination. Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64395 records a Unknown severity vulnerability in ksmbd: require source read access for duplicate extents. 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.
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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=eb817368f50c1cbe1bd07044124aad7db6330e3a <2d2ab6983620c2d60ce7db72133984ca3873b929 || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <67bdad9cf01b25030e3bf00bbce6c309319d6663 || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <db231af842868268839f9f9619c68cb27830d8be || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <a10942af27832c2761d020863a46e79bebe0567d || >=eb817368f50c1cbe1bd07044124aad7db6330e3a <cedff600f1642aa982178503552f0d007bc829c8 | 2d2ab6983620c2d60ce7db72133984ca3873b929, 67bdad9cf01b25030e3bf00bbce6c309319d6663, b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f, db231af842868268839f9f9619c68cb27830d8be, a10942af27832c2761d020863a46e79bebe0567d, cedff600f1642aa982178503552f0d007bc829c8 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination. Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.
Quoted source text, attributed separately from HOL analysis.