CVE-2026-64086hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer adm1266_pmbus_block_xfer() sets up the read transaction with .buf = data->read_buf, .len = ADM1266_PMBUS_BLOCK_MAX + 2, but read_buf in struct adm1266_data is declared as u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1]; For a max-length block response (length byte = 255 + up to 1 PEC byte), the i2c controller is told to write 257 bytes into a 256-byte buffer, putting one byte past the end of read_buf. The same response also makes the subsequent PEC compare if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) read a byte beyond the array. Bump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the buffer can hold the length byte, up to 255 payload bytes, and the PEC byte the i2c_msg length already accounts for.
Timeline
ID reserved
By Linux
Published
- 17 days later
· 17 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 397d3f523bfff2f4e3dacf9b1339bd76dc207f78
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 472744f69d25a2d5111ad62f1d62579dce2c13c8
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 528a9f88e88502d0c2f2052a279415074cd83715
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < d94ceb16e55b6d8019ab069e357c76ac42f0ffbc
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 2279c342d94eca225bf9f301c8806a05a1c81619
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < a6c802145a8de0830bca803c6d415f7e9e683624
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 487566cb1ccdf3756fdd7bf8d875e612ff3169bb
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.142 – ≤ 6.6.*
- unaffected 6.12.92 – ≤ 6.12.*
- unaffected 6.18.34 – ≤ 6.18.*
- unaffected 7.0.11 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/397d3f523bfff2f4e3dacf9b1339bd76dc207f78 (opens in a new tab)
- https://git.kernel.org/stable/c/472744f69d25a2d5111ad62f1d62579dce2c13c8 (opens in a new tab)
- https://git.kernel.org/stable/c/528a9f88e88502d0c2f2052a279415074cd83715 (opens in a new tab)
- https://git.kernel.org/stable/c/d94ceb16e55b6d8019ab069e357c76ac42f0ffbc (opens in a new tab)
- https://git.kernel.org/stable/c/bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694 (opens in a new tab)
- https://git.kernel.org/stable/c/2279c342d94eca225bf9f301c8806a05a1c81619 (opens in a new tab)
- https://git.kernel.org/stable/c/a6c802145a8de0830bca803c6d415f7e9e683624 (opens in a new tab)
- https://git.kernel.org/stable/c/487566cb1ccdf3756fdd7bf8d875e612ff3169bb (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45659 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-64086)Record last updated .