Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommupt: Fix short gather if the unmap goes into a large mapping unmap has the odd behavior that it can unmap more than requested if the ending point lands within the middle of a large or contiguous IOPTE. In this case the gather should flush everything unmapped which can be larger than what was requested to be unmapped. The gather was only flushing the range requested to be unmapped, not extending to the extra range, resulting in a short invalidation if the caller hits this special condition. This was found by the new invalidation/gather test I am adding in preparation for ARMv8. Claude deduced the root cause. As far as I remember nothing relies on unmapping a large entry, so this is likely not a triggerable bug.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.19, < 6.19.12 |
References
- https://git.kernel.org/stable/c/50ecd96a28f712f8b682c0441f4cb9b086d28816Patch
- https://git.kernel.org/stable/c/ee6e69d032550687a3422504bfca3f834c7b5061Patch
FAQ
What is CVE-2026-31735?
CVE-2026-31735 is a vulnerability with a CVSS score of 8.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: iommupt: Fix short gather if the unmap goes into a large mapping unmap has the odd behavior that it can unmap more than requested ...
How severe is CVE-2026-31735?
CVE-2026-31735 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31735?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.