---
id: "CVE-2026-99099"
kind: "vulnerability"
aliases: ["CVE-2026-99099"]
title: "Linux kernel: AMD CPU may skip TLB invalidation, leaving stale mappings"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["amd-x86", "infrastructure", "linux-kernel", "self-hosted"]
not_affected_if: ["non-amd-hardware"]
published_at: "2026-10-26T15:16:48+00:00"
first_seen_at: "2026-10-26T16:02:26+00:00"
updated_at: "2026-10-26T16:04:02+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99099", "first_seen_at": "2026-10-26T16:02:26+00:00"}]
---

# Linux kernel: AMD CPU may skip TLB invalidation, leaving stale mappings

On some AMD processors, an INVLPGB/TLBSYNC instruction pair can fail to invalidate a TLB entry. The kernel now detects the erratum and applies a software workaround when no microcode fix is present.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- Update to a Linux kernel release that includes the x86/CPU/AMD erratum #1718 fix
- Install the latest AMD microcode package if one is available for the processor

## Timeline

- 2026-10-26T16:02:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-99099

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_