iio: pressure: bmp280: fix stack leak in bmp580 trigger handler

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Summary

CVECVE-2026-63965
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:15 UTC
Updated2026-07-19 16:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iio: pressure: bmp280: fix stack leak in bmp580 trigger handler bmp580_trigger_handler() declares its scan buffer on the stack without an initializer and then memcpy()s 3 bytes of 24-bit sensor data into each 4-byte __le32 field. The high byte of comp_temp and comp_press is left uninitialized, and the channel storagebits is 32, so two bytes of stack are pushed to userspace per scan. This is a regression from when the buffer lived in the private data, the move to a stack-local struct dropped the implicit zeroing. bme280_trigger_handler() was fixed up to handle this bug, but this driver was not fixed because there was no padding hole, but rather a short-fill issue. Fix this all by just zero-initializing the structure on the stack.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 872c8014e05ed47b8a7c0f5ba4311279a637150b a58400f58f82f3d8de9c067aa7cda690228c1ecc git Not specified
CNA Linux Linux affected 872c8014e05ed47b8a7c0f5ba4311279a637150b 58dfb6fe9dc80270cf7cc014837af4cbf928e3aa git Not specified
CNA Linux Linux affected 872c8014e05ed47b8a7c0f5ba4311279a637150b 387c86b582e0782ab332e7bfcd4e6e3f93922961 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/387c86b582e0782ab332e7bfcd4e6e3f93922961 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/58dfb6fe9dc80270cf7cc014837af4cbf928e3aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a58400f58f82f3d8de9c067aa7cda690228c1ecc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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