CVE-2026-64086hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer
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: 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.
- 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
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 407dc802a9c0809ca6a48de4b4c63305eb84ef56 builds before 397d3f523bfff2f4e3dacf9b1339bd76dc207f78; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before 472744f69d25a2d5111ad62f1d62579dce2c13c8; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before 528a9f88e88502d0c2f2052a279415074cd83715; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before d94ceb16e55b6d8019ab069e357c76ac42f0ffbc; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before 2279c342d94eca225bf9f301c8806a05a1c81619; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before a6c802145a8de0830bca803c6d415f7e9e683624; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before 487566cb1ccdf3756fdd7bf8d875e612ff3169bb | CNA record |
linux linux_kernel linux:linux_kernel | from 5.10 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/397d3f523bfff2f4e3dacf9b1339bd76dc207f78patch
- https://git.kernel.org/stable/c/472744f69d25a2d5111ad62f1d62579dce2c13c8patch
- https://git.kernel.org/stable/c/528a9f88e88502d0c2f2052a279415074cd83715patch
- https://git.kernel.org/stable/c/d94ceb16e55b6d8019ab069e357c76ac42f0ffbcpatch
- https://git.kernel.org/stable/c/bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694patch
- https://git.kernel.org/stable/c/2279c342d94eca225bf9f301c8806a05a1c81619patch
- https://git.kernel.org/stable/c/a6c802145a8de0830bca803c6d415f7e9e683624patch
- https://git.kernel.org/stable/c/487566cb1ccdf3756fdd7bf8d875e612ff3169bbpatch
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.