CVE-2026-72285KVM: TDX: Reject concurrent change to CPUID entry count
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0bd0a4a1428baaf4447e95f0832492d9e3d64961 before d6b5aba65e99531c97b146622a406c75653819d5; from 0bd0a4a1428baaf4447e95f0832492d9e3d64961 before cfbebb55e5127dc162e73fa8956000055a78606c | CNA record |
References
- https://git.kernel.org/stable/c/d6b5aba65e99531c97b146622a406c75653819d5
- https://git.kernel.org/stable/c/cfbebb55e5127dc162e73fa8956000055a78606c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.