CVE-2026-99099
Description
A flaw was found in the Linux kernel. On systems running affected AMD processors without microcode fixes, the processor may fail to properly clear cached entries in the Translation Lookaside Buffer (TLB), a hardware cache used to speed up memory address translation, during flush operations. A local user could exploit this condition to cause stale address mappings to persist, potentially leading to memory corruption, denial of service, or unauthorized information disclosure.
Statement
This vulnerability is rated as having a Moderate impact for Red Hat because successful exploitation requires local user access and complex timing to trigger the erratum on specific AMD hardware. The issue cannot be exploited remotely and depends on processor-level broadcast invalidation instructions that are not present or enabled in earlier enterprise distributions such as Red Hat Enterprise Linux 7, 8, and 9. On supported platforms utilizing these instructions without platform microcode workarounds, an authenticated local attacker could potentially access stale address translations to cause memory corruption or a denial of service.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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