CVE-2026-98003
UnknownSummary
In the Linux kernel iommu/amd driver, iommu_init_ga_log() unconditionally assigns the ga_log and ga_log_tail pointers, so each resume replaces the boot-time pointers and leaks both allocations. The function also uses GFP_KERNEL from a syscore resume callback, where interrupts are disabled and non-boot CPUs are offline. The fix returns early if both buffers are already allocated and clears the pointers in free_ga_log().
Risk Assessment
Each system resume causes a memory leak and potential IOMMU state corruption, which can lead to instability or denial of service after many suspend/resume cycles. Using GFP_KERNEL in an inappropriate context may cause allocation problems.
Recommendation
Update the Linux kernel to a version containing the fix. On AMD systems with IOMMU, avoid frequent suspend/resume cycles until patched.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS