ethtool: cmis: validate start_cmd_payload_size from module
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.
CVE-2026-63995
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-63995
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c4f78134d45c9619339c96b4bea380b1d0699788",
"lessThan": "63112b4515469d00008452d9cfe3fb3bf1aa2df3",
"versionType": "git"
},
{
"status": "affected",
"version": "c4f78134d45c9619339c96b4bea380b1d0699788",
"lessThan": "0696709e951be54c699664adf546d16e28974d53",
"versionType": "git"
},
{
"status": "affected",
"version": "c4f78134d45c9619339c96b4bea380b1d0699788",
"lessThan": "a46340da00385be7fb16c62425ebc20006f2d5d8",
"versionType": "git"
},
{
"status": "affected",
"version": "c4f78134d45c9619339c96b4bea380b1d0699788",
"lessThan": "12c2496a71f82f63617971ca9b730dffa05cf58b",
"versionType": "git"
}
],
"programFiles": [
"net/ethtool/cmis_fw_update.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ethtool/cmis_fw_update.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-63995
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40924 · Revision 1
- Added to Heist Feed
- Publisher date