CVE-2026-98003
Received Received - Intake

AMD IOMMU GA Log Buffer Leak on Resume

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Do not reallocate GA log buffers on resume Commit c5e1a1eb9279 ("iommu/amd: Simplify and Consolidate Virtual APIC (AVIC) Enablement") moved the GA log allocation from iommu_init_pci() to enable_iommus_vapic(), which is called on every resume. iommu_init_ga_log() assigns iommu->ga_log and iommu->ga_log_tail unconditionally. Each resume therefore replaces the boot-time pointers and leaks both old allocations. The function also uses GFP_KERNEL from a syscore resume callback, where interrupts are disabled and the non-boot CPUs are offline. Return early if both buffers are already allocated. Clear the pointers in free_ga_log() so a partial allocation failure cannot leave ga_log dangling.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-98003
EUVD
EUVD-2026-86656

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability in the Linux kernel involves a memory leak during system resume operations. The issue occurs in the AMD IOMMU driver where GA log buffers are reallocated without freeing the previous ones, causing memory leaks. The function iommu_init_ga_log() assigns new pointers without checking existing allocations, leading to leaks of both old buffers.

Detection Guidance

This vulnerability is specific to the Linux kernel's IOMMU/AMD GA log buffer handling. Detection requires checking kernel logs for GA log buffer reallocation errors during resume or boot. Use dmesg | grep -i 'ga_log' or journalctl -k | grep -i 'ga_log' to inspect kernel logs for related errors.

Impact Analysis

This vulnerability can lead to gradual memory exhaustion over time as the system resumes multiple times. It may cause system instability, reduced performance, or unexpected crashes due to running out of available memory. Systems with frequent suspend/resume cycles are more affected.

Mitigation Strategies

Apply the kernel patch that resolves this issue by updating to a patched Linux kernel version. Monitor kernel updates from your distribution and install them promptly. No immediate workaround is suggested beyond patching.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-98003. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart