---
id: "CVE-2026-56930"
page: "https://infrastack.ai/live/CVE-2026-56930"
kind: "vulnerability"
aliases: ["CVE-2026-56930"]
title: "Linux kernel SMMU driver: stale TLB entries let local users escalate privileges"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["arm-smmu", "infrastructure", "linux", "linux-kernel"]
not_affected_if: ["unknown"]
published_at: "2026-11-10T20:19:15+00:00"
first_seen_at: "2026-11-10T20:46:07+00:00"
updated_at: "2026-11-10T20:53:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56930", "first_seen_at": "2026-11-10T20:46:07+00:00"}]
exploit_sources: []
---

# Linux kernel SMMU driver: stale TLB entries let local users escalate privileges

Link for people: https://infrastack.ai/live/CVE-2026-56930 (this .md is for agents)

In the kernel's SMMU (IOMMU) driver, stale translation lookaside buffer entries can be kept across stream identifiers because of a confused deputy flaw. A local user with no extra privileges can use this to escalate privileges to higher levels.

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

## Timeline

- 2026-11-10T20:46:07+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-56930

## From the sources

In smmu_find_ste of smmu.c, there is a possible way to retain stale translation lookaside buffer entries across stream identifiers due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_