hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64084
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) cap PDIO scan in get_multiple at ADM1266_PDIO_NR adm1266_gpio_get_multiple() iterates the PDIO portion of the caller-supplied mask using for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) { ... } where ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233), not the number of PDIO pins. The intended upper bound is ADM1266_GPIO_NR + ADM1266_PDIO_NR = 25. gpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip), so the iteration walks find_next_bit() up to 242, reading up to 217 extra bits (a handful of unsigned-long words: four on 64-bit, seven on 32-bit) of whatever lives past the end of the mask in the caller's stack. Any incidental set bit in that range then drives a set_bit(gpio_nr, bits) call that writes past the end of the caller-supplied bits array too -- both out-of-bounds. Substitute ADM1266_PDIO_NR for the constant so the scan stops at the last real PDIO bit.

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 0.082490000 (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 d98dfad35c38c037b37c4adc99df01da571031a5 d0593e15fdeb56048a72c5c6e720f702759d0ccd git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 17cee2f59029039416e8f6303050038eb59ba149 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 299efd14c2eda7e5fd40025e54addd4151a01081 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 4d1da9a6be5a8156c532d571c2ed237169f99244 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 b96c7f0bc0713dc6403912f6527d4ff9168d6fe6 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 d7834d92251baade796812876e95555e2066fa9f 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/4d1da9a6be5a8156c532d571c2ed237169f99244 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/299efd14c2eda7e5fd40025e54addd4151a01081 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b96c7f0bc0713dc6403912f6527d4ff9168d6fe6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17cee2f59029039416e8f6303050038eb59ba149 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7834d92251baade796812876e95555e2066fa9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0593e15fdeb56048a72c5c6e720f702759d0ccd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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