CVE-2025-40106

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: fix divide-by-zero in comedi_buf_munge() The comedi_buf_munge() function performs a modulo operation `async->munge_chan %= async->cmd.chanlist_len` without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path. Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging. This prevents potential kernel panics from malformed user commands.

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References

Other References

https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9 https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974 https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c

Frequently Asked Questions

What is CVE-2025-40106? +

In the Linux kernel, the following vulnerability has been resolved: comedi: fix divide-by-zero in comedi_buf_munge() The comedi_buf_munge() function performs a modulo operation `async->munge_chan %= async->cmd.chanlist_len` without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path. Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging. This prevents potential kernel panics from malformed user commands.

How do I check if I'm vulnerable to CVE-2025-40106? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2025-40106

Description

References

Other References

Frequently Asked Questions

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