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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2024-26990

KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status Check kvm_mmu_page_ad_need_write_protect() when deciding whether to write-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU accounts for any role-specific reasons for disabling D-bit dirty logging. Specifically, TDP MMU SPTEs must be write-protected when the TDP MMU is being used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled. KVM always disables PML when running L2, even when L1 and L2 GPAs are in the some domain, so failing to write-protect TDP MMU SPTEs will cause writes made by L2 to not be reflected in the dirty log. [sean: massage shortlog and changelog, tweak ternary op formatting]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 5982a5392663b30f57ee90b0372c19a7e9cb655a to < cdf811a937471af2d1facdf8ae80e5e68096f1edaffected
  • 5982a5392663b30f57ee90b0372c19a7e9cb655a to < e20bff0f1b2de9cfe303dd35ff46470104a87404affected
  • 5982a5392663b30f57ee90b0372c19a7e9cb655a to < 2673dfb591a359c75080dd5af3da484b89320d22affected

Linux Linux

Default version status: affected

  • 6.4affected
  • 0 to < 6.4unaffected
  • 6.6.29 to ≤ 6.6.*unaffected
  • 6.8.8 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References