Home

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.

PUBLISHED Reserved 2026-03-09 | Published 2026-05-01 | Updated 2026-05-03 | Assigner Linux




HIGH: 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Product status

Default status
unaffected

7c53f4238aa8bfb476e177263133ead2eeb8d55d (git) before 50ecd96a28f712f8b682c0441f4cb9b086d28816
affected

7c53f4238aa8bfb476e177263133ead2eeb8d55d (git) before ee6e69d032550687a3422504bfca3f834c7b5061
affected

Default status
affected

6.19
affected

Any version before 6.19
unaffected

6.19.12 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/50ecd96a28f712f8b682c0441f4cb9b086d28816

git.kernel.org/...c/ee6e69d032550687a3422504bfca3f834c7b5061

cve.org (CVE-2026-31735)

nvd.nist.gov (CVE-2026-31735)

Download JSON