CVE-2025-38481 Information

Jul 29, 2025 cve

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.

Reference

https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90 https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76

CNNVD-202507-3442 (Published: 2025-07-28)

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