Riskcovery

CVE-2026-72285

KVM: TDX: Reject concurrent change to CPUID entry count

State
Published
Severity
7.8 High
Published
Aug 15, 2026
Updated
Aug 17, 2026
Reserved
Aug 9, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

KVM: TDX: Reject concurrent change to CPUID entry count

Reject KVM_TDX_INIT_VM if userspace changes cpuid.nent between the initial read and the subsequent copy of the initialization data.

tdx_td_init() first reads user_data->cpuid.nent to size the flexible kvm_tdx_init_vm copy. The copied structure also contains cpuid.nent, and that field can differ from the value used to size the allocation if userspace modifies the input concurrently. setup_tdparams_cpuids() later passes init_vm->cpuid.nent to kvm_find_cpuid_entry2(), which uses it as the array bound for the copied entries.

Require the copied count to match the value used to size the allocation so that CPUID parsing cannot access beyond the entries actually copied.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 0bd0a4a1428baaf4447e95f0832492d9e3d64961 to before d6b5aba65e99531c97b146622a406c75653819d5Affected
  • 0bd0a4a1428baaf4447e95f0832492d9e3d64961 to before cfbebb55e5127dc162e73fa8956000055a78606cAffected
LinuxLinux
  • 6.19Affected
  • before 6.19Not affected
  • 7.1.5 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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