CVE-2025-38481

Summary

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.

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

References

• https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93
• https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb
• https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44
• 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/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76
• https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc

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