Answer in brief
CVE-2025-39943 records a Critical severity (CVSS 9.4) vulnerability in ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer. 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.
CVSS is 9.4. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2ea086e35c3d726a3bacd0a971c1f02a50e98206 <773fddf976d282ef059c36c575ddb81567acd6bc || >=2ea086e35c3d726a3bacd0a971c1f02a50e98206 <bdaab5c6538e250a9654127e688ecbbeb6f771d5 || >=2ea086e35c3d726a3bacd0a971c1f02a50e98206 <eb0378dde086363046ed3d7db7f126fc3f76fd70 || >=2ea086e35c3d726a3bacd0a971c1f02a50e98206 <8be498fcbd5b07272f560b45981d4b9e5a2ad885 || >=2ea086e35c3d726a3bacd0a971c1f02a50e98206 <529b121b00a6ee3c88fb3c01b443b2b81f686d48 || >=2ea086e35c3d726a3bacd0a971c1f02a50e98206 <5282491fc49d5614ac6ddcd012e5743eecb6a67c | 773fddf976d282ef059c36c575ddb81567acd6bc, bdaab5c6538e250a9654127e688ecbbeb6f771d5, eb0378dde086363046ed3d7db7f126fc3f76fd70, 8be498fcbd5b07272f560b45981d4b9e5a2ad885, 529b121b00a6ee3c88fb3c01b443b2b81f686d48, 5282491fc49d5614ac6ddcd012e5743eecb6a67c |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Oct 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 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: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer If data_offset and data_length of smb_direct_data_transfer struct are invalid, out of bounds issue could happen. This patch validate data_offset and data_length field in recv_done.
Quoted source text, attributed separately from HOL analysis.