CVE-2025-21656: Linux kernel · hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 14:18 UTC
Rated Low 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 21 Jan 2025
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
A patch has been applied to the Linux kernel to fix this issue by properly handling positive error codes from scsi_execute_cmd(). Users should update to the fixed kernel version once available. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's hwmon drivetemp driver caused it to produce garbage data when SCSI errors occur. The issue arises because the driver incorrectly handles positive error codes from the scsi_execute_cmd() function, leading to uninitialized data being reported to userspace, for example, if a disk drive is disconnected. This flaw has been fixed by modifying the driver to return a proper error code (-EIO) when positive error codes are encountered.
References
- git.kernel.org/stable/c/babdf2a11329d30dc5086eb7a938a360aa490282 (opens in a new tab)
- git.kernel.org/stable/c/0435d35f9d511fa5ddba49c9f68f947e395c93f9 (opens in a new tab)
- git.kernel.org/stable/c/f9723fd2770ef5563ff1685f72bcc1c411219c29 (opens in a new tab)
- git.kernel.org/stable/c/53e25b10a28edaf8c2a1d3916fd8929501a50dfc (opens in a new tab)
- git.kernel.org/stable/c/42268d885e44af875a6474f7bba519cc6cea6a9d (opens in a new tab)
- git.kernel.org/stable/c/82163d63ae7a4c36142cd252388737205bb7e4b9 (opens in a new tab)