# CVE-2026-58809: ARM SMMU v3 out-of-bounds write in domain configuration

Source: https://junglewise.ai/threats/cve-2026-58809-in-smmu-domain-config-s1-of-arm-smmu-v3-c-there-is-a-possible-oob  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-58809 · Severity: info · Published 2026-11-10

The ARM SMMU (System Memory Management Unit) v3 is a security component that controls memory access on Android devices and other systems using ARM processors. A missing bounds check in the domain configuration code allows an attacker with system-level privileges to write data outside allocated memory, potentially compromising the integrity of the platform's security boundaries and device firmware.

## Quick answers

**Is CVE-2026-58809 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58809 being exploited in the wild.

**How severe is CVE-2026-58809?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** Android Pixel devices with pKVM SMMU; ARM SMMU v3 as used in pKVM.

**Is there a fix for CVE-2026-58809?** Yes: fixed in Android Pixel devices with security patch level 2026-11-05 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-58809 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-58809?** Check whether you run Android or ARM SMMU v3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Android Pixel devices with security patch level 2026-11-05 or later

## Technical details

The vulnerability is an out-of-bounds write in the smmu_domain_config_s1 function of arm-smmu-v3.c, caused by a missing bounds check on array or buffer operations. An attacker with System execution privileges can trigger this to write beyond buffer boundaries, affecting the pKVM SMMU (protected kernel virtual machine stage 2 SMMU). The vulnerability requires system-level access but no user interaction.

## Affected products

- Android Pixel devices with pKVM SMMU
- ARM SMMU v3 as used in pKVM

## Timeline

- 2026-11-10: disclosed
- 2026-11-05: patched: Security patch level 2026-11-05 or later addresses this issue for Pixel devices

## References

- [https://source.android.com/docs/security/bulletin/pixel/2026/2026-11-01](https://source.android.com/docs/security/bulletin/pixel/2026/2026-11-01)

## Related threats

- [ARM SMMUv3 privilege escalation in arm-smmu-v3 DMA mapping](https://junglewise.ai/threats/cve-2026-56946-in-smmu-unmap-visit-leaf-of-arm-smmu-v3-c-there-is-a-possible-way)