CVE-2026-63932

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4572a70b3681e38055c78d12fb68cd147bdbee7d < a5a05410cb34bfa486d63684cdc1f87a3b13f20aaffected
LinuxLinux4572a70b3681e38055c78d12fb68cd147bdbee7d < ea69e7a6efa88ef32090a91064c362738cc19dddaffected
LinuxLinux4572a70b3681e38055c78d12fb68cd147bdbee7d < 673478bc29cf72010faaf293c1c8c667393335a0affected
LinuxLinux6.16affected
LinuxLinux0 < 6.16unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References