Vulnerability in Linux
CVE-2025-21656
In the Linux kernel, the following vulnerability has been resolved: hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur scsi_execute_cmd() function can return both negative (linux codes) and positive (scsi_cmnd result field) error codes. Currently the driver just passes error codes of scsi_execute_cmd() to hwmon core, which is incorrect because hwmon only checks for negative error codes. This leads to hwmon reporting uninitialized data to userspace in case of SCSI errors (for example if the disk drive was disconnected). This patch checks scsi_execute_cmd() output and returns -EIO if it's error code is positive. [groeck: Avoid inline variable declaration for portability]
EPSS: 0.002 (10.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions 5b46903d8bf372e563bf2150d46b87fff197a109, 5.6, 0
- Linux Linux_kernel — versions 6.13
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-21656?
- CVE-2025-21656 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-01-21.
- How severe is CVE-2025-21656?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2025-21656 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.