Answer in brief
CVE-2026-63995 records a Unknown severity vulnerability in ethtool: cmis: validate start_cmd_payload_size from module. 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 | >=c4f78134d45c9619339c96b4bea380b1d0699788 <63112b4515469d00008452d9cfe3fb3bf1aa2df3 || >=c4f78134d45c9619339c96b4bea380b1d0699788 <0696709e951be54c699664adf546d16e28974d53 || >=c4f78134d45c9619339c96b4bea380b1d0699788 <a46340da00385be7fb16c62425ebc20006f2d5d8 || >=c4f78134d45c9619339c96b4bea380b1d0699788 <12c2496a71f82f63617971ca9b730dffa05cf58b | 63112b4515469d00008452d9cfe3fb3bf1aa2df3, 0696709e951be54c699664adf546d16e28974d53, a46340da00385be7fb16c62425ebc20006f2d5d8, 12c2496a71f82f63617971ca9b730dffa05cf58b |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Jul 19, 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: ethtool: cmis: validate start_cmd_payload_size from module The CMIS firmware update code reads start_cmd_payload_size from the module's FW Management Features CDB reply and uses it directly as the byte count for memcpy. The destination buffer is 112 bytes (ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious module (or corrupted response) can cause a OOB write later on in cmis_fw_update_start_download(). Let's error out. If modules that expect longer LPL writes actually exist we should revisit. struct cmis_cdb_start_fw_download_pl's definition has to move, no change there.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-63995 records a Unknown severity vulnerability in ethtool: cmis: validate start_cmd_payload_size from module. 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 | >=c4f78134d45c9619339c96b4bea380b1d0699788 <63112b4515469d00008452d9cfe3fb3bf1aa2df3 || >=c4f78134d45c9619339c96b4bea380b1d0699788 <0696709e951be54c699664adf546d16e28974d53 || >=c4f78134d45c9619339c96b4bea380b1d0699788 <a46340da00385be7fb16c62425ebc20006f2d5d8 || >=c4f78134d45c9619339c96b4bea380b1d0699788 <12c2496a71f82f63617971ca9b730dffa05cf58b | 63112b4515469d00008452d9cfe3fb3bf1aa2df3, 0696709e951be54c699664adf546d16e28974d53, a46340da00385be7fb16c62425ebc20006f2d5d8, 12c2496a71f82f63617971ca9b730dffa05cf58b |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Jul 19, 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: ethtool: cmis: validate start_cmd_payload_size from module The CMIS firmware update code reads start_cmd_payload_size from the module's FW Management Features CDB reply and uses it directly as the byte count for memcpy. The destination buffer is 112 bytes (ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious module (or corrupted response) can cause a OOB write later on in cmis_fw_update_start_download(). Let's error out. If modules that expect longer LPL writes actually exist we should revisit. struct cmis_cdb_start_fw_download_pl's definition has to move, no change there.
Quoted source text, attributed separately from HOL analysis.