UBUNTU-CVE-2026-99099: Medium severity vulnerability
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Fix AMD TLBI Erratum #1718 The processor may fail to invalidate a TLB entry while executing an INVLPGB/TLBSYNC instruction pair. Detect the erratum and apply a software workaround when a microcode fix is not present.
Event History
Frequently Asked Questions
Which systems need to consider this issue?
Systems using AMD processors are the relevant population, because the issue concerns AMD TLB invalidation behavior. The provided information does not identify specific processor models or Ubuntu package versions.
What is required for the workaround to be used?
The kernel detects AMD TLBI Erratum #1718 and applies a software workaround when a microcode fix is not present. Systems with an applicable microcode fix do not rely on that software workaround.
What is the immediate mitigation if a microcode update is unavailable?
Use a kernel containing the erratum detection and software workaround. The provided information does not specify any configuration-only mitigation or operational workaround.