hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors

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Summary

CVECVE-2026-64083
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:48 UTC
Updated2026-07-19 16:17:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors adm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the pin-status word as pins_status = read_buf[0] + (read_buf[1] << 8); right after i2c_smbus_read_block_data(), guarding only against an error return. A well-behaved device returns 2 bytes for GPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or 1-byte response too. If the device returns 0 bytes, both read_buf slots are uninitialized stack memory; if it returns 1 byte, read_buf[1] is. The composed value then flows through set_bit() into the caller's *bits in adm1266_gpio_get_multiple(), or into the return value of adm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and the char-dev ioctls). That leaks a few bits of kernel stack per request on any device whose firmware glitch, bus error, or hostile slave produces a short block-read response. Add the missing length check to both call sites and surface a short response as -EIO.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 fd9196aad9e5a3845cea17de3405ebc700382142 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 ee4799becf7d2af3778007e22c2e55c4009a49c7 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 c603b6c6840ac0c6285f5eefea0de6242710af21 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 eb3cd9bb590460c6127145cb245be925d23f5232 git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 64fa9328948ddcc0f7f3c23ea1756c126d9dffac git Not specified
CNA Linux Linux affected d98dfad35c38c037b37c4adc99df01da571031a5 a7232f68c43ca62f545049b7f5fbfc75137b843b 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/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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