{"id":"CVE-2026-98282","published":"2026-10-06T09:18:18.180","lastModified":"2026-10-07T07:17:07.920","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba\n\nThe commit b1af23d836f8 (\"KVM: PPC: iommu: Unify TCE checking\") unified\nIOBA parameter checking across KVM and VFIO into iommu_tce_check_ioba().\nWhile doing so, the passed in argument npages is ignored and constant\nvalue '1' is used leaving out a possible overflow as the callers can\nlegitimately be using npages > 1 for H_STUFF_TCE or H_PUT_TCE_INDIRECT\ncases.\n\nFix this by accounting for 'npages', checking for arithmetic overflow,\nand verifying that the entire requested range (ioba - offset + npages)\ndoes not exceed the table capacity 'size'.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0543813753ef5cfbd6fa96694f7acf783fa01af7","tags":[]},{"url":"https://git.kernel.org/stable/c/0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71","tags":[]},{"url":"https://git.kernel.org/stable/c/314091243159f8e3749bc719bb129f423f72fd86","tags":[]},{"url":"https://git.kernel.org/stable/c/3776bf56e06980e8a12c8c0565d9e6ac44965f03","tags":[]},{"url":"https://git.kernel.org/stable/c/98d8dcc4ebd10523507d4478e148809a7771a213","tags":[]},{"url":"https://git.kernel.org/stable/c/9fd9c9bbb05417f468a11fb6d145d7ff61f4a868","tags":[]},{"url":"https://git.kernel.org/stable/c/d48ceb6e1a6915c7bac4f902554a1047365cdff2","tags":[]},{"url":"https://git.kernel.org/stable/c/d6a1779129d936bc1fbab80181165da544eab736","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The flaw involves an overflow validation issue in the iommu_tce_check_ioba function, which can lead to potential security risks if not properly addressed.","exploitability":"Exploitation is moderately difficult as it requires specific conditions, including the use of npages > 1 for certain cases, and the vulnerability is only present in the iommu_tce_check_ioba function.","blast_radius":"If exploited, the impact could be significant, potentially leading to arbitrary code execution or system compromise, depending on the system's configuration and the privileges of the affected IOMMU.","remediation":"Upgrade to the version 5.19-rc1 or later, as the fix is included in this release.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["overflow","iommu","kernel","powerpc"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-07T08:59:03.542Z"}}