iommu/amd: Do not reallocate GA log buffers on resume

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Summary

CVECVE-2026-98003
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:28 UTC
Updated2026-09-25 11:17:28 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.051900000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c5e1a1eb9279fdb28d47ca2a4493a4c53b7d6a0b 94458b80d3b203c1c9e2c98aa7319b7713e006c0 git Not specified
CNA Linux Linux affected c5e1a1eb9279fdb28d47ca2a4493a4c53b7d6a0b b6be275d19cee01f8f1f08a2ff18337103d05d40 git Not specified
CNA Linux Linux affected c5e1a1eb9279fdb28d47ca2a4493a4c53b7d6a0b 00a7dd64888d6dd72110b40e2824a088cf7b7386 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b6be275d19cee01f8f1f08a2ff18337103d05d40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94458b80d3b203c1c9e2c98aa7319b7713e006c0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00a7dd64888d6dd72110b40e2824a088cf7b7386 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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