iio: chemical: mhz19b: reject oversized serial replies

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Summary

CVECVE-2026-63932
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:11 UTC
Updated2026-07-19 16:17:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iio: chemical: mhz19b: reject oversized serial replies mhz19b_receive_buf() appends each serdev chunk into the fixed MHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without checking that the chunk fits in the remaining space. A large callback can therefore overflow st->buf before the command path validates the reply. Reset the reply state before each command and reject oversized serial replies before copying them into the fixed buffer. When an oversized reply is detected, wake the waiter and report -EMSGSIZE instead of overwriting st->buf.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.097900000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4572a70b3681e38055c78d12fb68cd147bdbee7d a5a05410cb34bfa486d63684cdc1f87a3b13f20a git Not specified
CNA Linux Linux affected 4572a70b3681e38055c78d12fb68cd147bdbee7d ea69e7a6efa88ef32090a91064c362738cc19ddd git Not specified
CNA Linux Linux affected 4572a70b3681e38055c78d12fb68cd147bdbee7d 673478bc29cf72010faaf293c1c8c667393335a0 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/a5a05410cb34bfa486d63684cdc1f87a3b13f20a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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