CVE-2026-63995ethtool: cmis: validate start_cmd_payload_size from module
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c4f78134d45c9619339c96b4bea380b1d0699788 before 63112b4515469d00008452d9cfe3fb3bf1aa2df3; from c4f78134d45c9619339c96b4bea380b1d0699788 before 0696709e951be54c699664adf546d16e28974d53; from c4f78134d45c9619339c96b4bea380b1d0699788 before a46340da00385be7fb16c62425ebc20006f2d5d8; from c4f78134d45c9619339c96b4bea380b1d0699788 before 12c2496a71f82f63617971ca9b730dffa05cf58b | CNA record |
linux linux_kernel linux:linux_kernel | from 6.11 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/63112b4515469d00008452d9cfe3fb3bf1aa2df3patch
- https://git.kernel.org/stable/c/0696709e951be54c699664adf546d16e28974d53patch
- https://git.kernel.org/stable/c/a46340da00385be7fb16c62425ebc20006f2d5d8patch
- https://git.kernel.org/stable/c/12c2496a71f82f63617971ca9b730dffa05cf58bpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.