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In the Linux kernel, the following vulnerability has been resolved:
KVM: VMX: Prevent RSB underflow before vmenter
On VMX, there are some balanced returns between the time the guest's SPEC_CTRL value is written, and the vmenter.
Balanced returns (matched by a preceding call) are usually ok, but it's at least theoretically possible an NMI with a deep call stack could empty the RSB before one of the returns.
For maximum paranoia, don't allow *any* returns (balanced or otherwise) between the SPEC_CTRL write and the vmenter.
[ bp: Fix 32-bit build. ]
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernelUpgrade python3-perfUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernel-tools | Jun 13, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perf | Jun 11, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel | Jul 1, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-azureUpgrade linux-ibmUpgrade linux-realtimeUpgrade linuxUpgrade linux-oracle-5.15Upgrade linux-oracleUpgrade linux-azure-fde-5.15Upgrade linux-gkeopUpgrade linux-gcp-5.15Upgrade linux-azure-5.15Upgrade linux-riscv-5.15Upgrade linux-gcpUpgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linux-gke | Mar 19, 2025 | Feb 26, 2025 |
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