In 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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
4572a70b3681e38055c78d12fb68cd147bdbee7d affected < a5a05410cb34bfa486d63684cdc1f87a3b13f20a
4572a70b3681e38055c78d12fb68cd147bdbee7d affected < ea69e7a6efa88ef32090a91064c362738cc19ddd
4572a70b3681e38055c78d12fb68cd147bdbee7d affected < 673478bc29cf72010faaf293c1c8c667393335a0
Linux Linux affected
Version Status Constraints
6.16 affected —
0 unaffected < 6.16
6.18.35 unaffected ≤ 6.18.*
7.0.12 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0 cve-icon
https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a cve-icon
https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd cve-icon
History

Sun, 19 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Description In 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.
Title iio: chemical: mhz19b: reject oversized serial replies
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-19T14:55:31.460Z

Reserved: 2026-07-19T07:54:57.021Z

Link: CVE-2026-63932

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

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