CVE-2026-64153
Received Received - Intake

Linux Kernel IOMMU Map Sgtable Error Handling Fix

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/msm: Fix iommu_map_sgtable() return value check and avoid WARN Commit "iommu: return full error code from iommu_map_sg[_atomic]()" changed iommu_map_sgtable() to return an ssize_t and negative values in error cases, rather than a size_t and a zero. Store the return value in the appropriate type and in case of error, return it rather than WARNing. Patchwork: https://patchwork.freedesktop.org/patch/719685/

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-64153
EUVD
EUVD-2026-45838

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a flaw in the drm/msm driver's iommu_map_sgtable() function. A recent change modified the function to return an ssize_t type with negative values for errors instead of a size_t with zero. The issue arises when the return value is not stored in the correct type, leading to potential incorrect error handling and a WARN message.

Detection Guidance

This vulnerability is specific to the Linux kernel's drm/msm driver and relates to IOMMU mapping errors. Detection requires checking kernel logs for IOMMU-related warnings or errors, particularly around drm/msm operations. Use commands like dmesg | grep -i iommu or journalctl -k | grep -i msm to inspect system logs for relevant errors.

Impact Analysis

This vulnerability could cause system instability or crashes if the iommu_map_sgtable() function fails to properly handle errors. Users relying on systems with affected Linux kernel versions may experience unexpected behavior or system failures during graphics or memory operations.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel issue related to IOMMU mapping errors, which does not involve data privacy, security controls, or protected health information handling.

Mitigation Strategies

Apply the kernel patch referenced in the CVE description (Patchwork link provided). Update to a kernel version that includes the fix. Monitor system logs for IOMMU errors post-update to confirm resolution.

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