CVE-2026-99099
Received Received - Intake

AMD CPU TLBI Erratum #1718 Workaround

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: kernel.org

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-26
Last Modified
2026-10-26
Generated
2026-10-26
AI Q&A
2026-10-26
EPSS Evaluated
N/A
NVD
CVE-2026-99099
EUVD
EUVD-2026-109905

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
Linux Linux 82378c6c2f435dba66145609de16bf44a9de6303
Linux Linux 82378c6c2f435dba66145609de16bf44a9de6303
Linux Linux 82378c6c2f435dba66145609de16bf44a9de6303
Linux Linux 6.15

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability affects the Linux kernel on x86 systems with AMD processors. It involves a failure to properly invalidate a Translation Lookaside Buffer (TLB) entry when executing specific instructions (INVLPGB/TLBSYNC). This could lead to stale data remaining in the TLB, potentially causing incorrect memory access or system instability.

Detection Guidance

Detection requires checking for AMD CPU models affected by erratum #1718 and verifying if microcode fixes are applied. Use commands like 'grep -i amd /proc/cpuinfo' to identify AMD CPUs and 'dmesg | grep -i microcode' to check microcode status. If no microcode fix is present, software workaround must be applied.

Impact Analysis

The impact includes potential system crashes, data corruption, or security issues due to incorrect memory handling. Systems relying on precise TLB management may experience performance degradation or unexpected behavior. Users should apply the provided software workaround if microcode fixes are unavailable.

Mitigation Strategies

Apply the latest microcode update for AMD processors if available. If no microcode fix exists, implement a kernel-level workaround by enabling the software fix via kernel parameters or patches. Monitor vendor advisories for updates.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-99099. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart