CVE-2026-31735
Published: May 1, 2026
Modified: May 11, 2026
CVSS v3.1
8.8
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.
| Vendor | Product | Versions |
|---|---|---|
Linux | Linux | affected 7c53f4238aa8bfb476e177263133ead2eeb8d55d - < 50ecd96a28f712f8b682c0441f4cb9b086d28816affected 7c53f4238aa8bfb476e177263133ead2eeb8d55d - < ee6e69d032550687a3422504bfca3f834c7b5061 |
Linux | Linux | affected 6.19unaffected 0 - < 6.19unaffected 6.19.12 - <= 6.19.*unaffected 7.0 - <= * |
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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