CVE-2026-63932: Linux kernel · iio: chemical: mhz19b: reject oversized serial replies
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 15:48 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
Apply the official Linux kernel patch that resets the reply state before each command and rejects oversized serial replies, returning an error instead of allowing buffer overflow. Since this is a kernel vulnerability, updating to a fixed kernel version containing this patch is recommended.
Description
A vulnerability in the Linux kernel's iio chemical mhz19b driver allows oversized serial replies to overflow a fixed-size buffer. The function mhz19b_receive_buf() appends serial data chunks without verifying if they fit in the buffer, potentially causing a buffer overflow before validation. The issue is addressed by resetting the reply state before each command and rejecting oversized replies, returning an error instead of overwriting memory.