CVE-2025-38481

medium

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1.

References

https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76

https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3

https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90

https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c

https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc

Details

Source: Mitre, NVD

Published: 2025-07-28

Updated: 2025-07-29

Risk Information

CVSS v2

Base Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Severity: Medium

EPSS

EPSS: 0.00018