hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64086
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:49 UTC
Updated2026-07-20 15:17:07 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001840000 probability, percentile 0.082510000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 397d3f523bfff2f4e3dacf9b1339bd76dc207f78 git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 472744f69d25a2d5111ad62f1d62579dce2c13c8 git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 528a9f88e88502d0c2f2052a279415074cd83715 git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 d94ceb16e55b6d8019ab069e357c76ac42f0ffbc git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694 git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 2279c342d94eca225bf9f301c8806a05a1c81619 git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 a6c802145a8de0830bca803c6d415f7e9e683624 git Not specified
CNA Linux Linux affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 487566cb1ccdf3756fdd7bf8d875e612ff3169bb git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/397d3f523bfff2f4e3dacf9b1339bd76dc207f78 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d94ceb16e55b6d8019ab069e357c76ac42f0ffbc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/472744f69d25a2d5111ad62f1d62579dce2c13c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2279c342d94eca225bf9f301c8806a05a1c81619 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6c802145a8de0830bca803c6d415f7e9e683624 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/528a9f88e88502d0c2f2052a279415074cd83715 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/487566cb1ccdf3756fdd7bf8d875e612ff3169bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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