CVE-2026-98282

Received Received - Intake

BaseFortify

Publication date: 2026-10-06

Last updated on: 2026-10-19

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba The commit b1af23d836f8 ("KVM: PPC: iommu: Unify TCE checking") unified IOBA parameter checking across KVM and VFIO into iommu_tce_check_ioba(). While doing so, the passed in argument npages is ignored and constant value '1' is used leaving out a possible overflow as the callers can legitimately be using npages > 1 for H_STUFF_TCE or H_PUT_TCE_INDIRECT cases. Fix this by accounting for 'npages', checking for arithmetic overflow, and verifying that the entire requested range (ioba - offset + npages) does not exceed the table capacity 'size'.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-06

Last Modified

2026-10-19

Generated

2026-10-19

AI Q&A

2026-10-06

EPSS Evaluated

2026-10-18

NVD

CVE-2026-98282

EUVD

EUVD-2026-93210

Affected Vendors & Products

Vendor	Product	Version / Range
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	b1af23d836f811137d504d14d4cbdd01929dec34
Linux	Linux	4.12

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves incorrect overflow validation in the iommu_tce_check_ioba function. The issue occurs because the function ignores the npages argument and always uses a constant value of 1, which can lead to missed overflow checks when npages is greater than 1. This affects operations like H_STUFF_TCE or H_PUT_TCE_INDIRECT that legitimately use larger npages values.

Detection Guidance

This vulnerability affects the Linux kernel's powerpc/iommu subsystem, specifically the iommu_tce_check_ioba function. Detection requires checking kernel versions and examining IOMMU-related logs or errors. Commands like 'uname -a' to check kernel version and 'dmesg | grep -i iommu' to review IOMMU logs may help identify affected systems.

Impact Analysis

This vulnerability could allow an attacker with access to the system to cause a buffer overflow or memory corruption in the IOMMU (Input-Output Memory Management Unit) subsystem. This might lead to system crashes, privilege escalation, or unauthorized access to sensitive data depending on the system configuration and usage.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a low-level kernel issue in the Linux powerpc/iommu subsystem that could lead to memory corruption or privilege escalation in specific configurations. Compliance impacts would only occur if this flaw were exploited to bypass security controls, which is not described in the provided context.

Mitigation Strategies

Apply the Linux kernel patch that fixes the overflow validation in iommu_tce_check_ioba. Update to a patched kernel version where the commit b1af23d836f8 is included.

Hi! I’m here to help you understand CVE-2026-98282. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70