CVE.org (no NVD analysis yet)· CNA redhat

CVE-2026-121876: Sandboxed-containers: kernel: systemd-gpt-auto-generator: guest data leakage in confidential computing (sandboxed containers)

HighCVSS 7.9 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org

A flaw was found in the interaction between systemd-gpt-auto-generator and confidential computing guest VM images in OpenShift Sandboxed Containers (confidential peer pods). systemd-gpt-auto-generator automatically discovers and mounts GPT partitions by type GUID at boot with no user confirmation. In the confidential computing threat model, where the host/hypervisor is the adversary, a malicious host can inject partitions into the guest's virtual disk. Most critically, injecting a swap partition causes the guest kernel to page out TEE-encrypted memory to a host-controlled block device, breaking the confidentiality guarantee of the hardware TEE (AMD SEV-SNP, Intel TDX). The PodVM images use a GPT-partitioned disk with dm-verity on the root partition. However, the roothash= kernel parameter only disables root auto-discovery — non-root partitions (swap, /home, /var, /srv, /var/tmp) are still auto-discovered and mounted. The generator is shipped unmasked in the RHEL systemd-udev subpackage, and no kernel command line parameter in the measured UKI addon disables it. Additionally, the PodVM measurement script captures PCRs 3, 9, 11, and 12, but not PCR 5 (GPT partition table), so partition table modifications are not detected by remote attestation.

Info leak

Published: Nov 12, 2026
Updated: Nov 12, 2026
EPSS: —
CWE: CWE-359

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · —

CNA vs NVD score

NVD: 7.9
CNA · redhat: 7.9; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

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Affected systems

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

Red Hat Red Hat Enterprise Linux 10
- all versionsaffected
Red Hat Red Hat Enterprise Linux 6
- all versionsaffected
Red Hat Red Hat Enterprise Linux 7
- all versionsaffected
- all versionsaffected
Red Hat Red Hat Enterprise Linux 8
- all versionsaffected
- all versionsaffected
Red Hat Red Hat Enterprise Linux 9
- all versionsaffected
- all versionsaffected
Red Hat Red Hat OpenShift Container Platform 4
- all versionsaffected
- all versionsaffected
Red Hat Red Hat OpenShift Container Platform 5
- all versionsaffected

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red hat: all records

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Published before and after this one in the same product

← EarlierCVE-2026-91151Nov 11, 2026 · Cockpit: cockpit: local privilege escalation via insecure symlink handling in public key addition helper
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30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.