# Multiple Ubuntu Linux kernel vulnerabilities

Published: 2026-06-26 · Severity: high
Canonical: https://vorant.io/reports/6def3913-3896-5a20-bdd4-96f43f0b5fd6/multiple-ubuntu-linux-kernel-vulnerabilities

> Multiple vulnerabilities in Ubuntu Linux kernel allow privilege escalation, data confidentiality breach, and security policy bypass.

CERT-FR has published an advisory documenting multiple vulnerabilities affecting the Linux kernel in Ubuntu 20.04 ESM, 22.04 LTS, and 26.04 LTS. The vulnerabilities enable attackers to achieve privilege escalation, breach data confidentiality, and bypass security policies. The advisory references 24 distinct CVE identifiers spanning CVE-2026-31419 through CVE-2026-47337, indicating a broad range of kernel subsystem issues. Ubuntu has released security bulletins USN-8388-2, USN-8461-1, and USN-8462-1 (all dated June 22, 2026) providing patches for affected systems. Defenders running these Ubuntu versions should prioritize applying the available kernel updates to mitigate the identified risks.

## Mentioned in this report

- Vulnerabilities: CVE-2026-31419, CVE-2026-31431 (KEV), CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-43284 (weaponized), CVE-2026-43494, CVE-2026-43500 (weaponized), CVE-2026-43503 (weaponized), CVE-2026-45998, CVE-2026-46000, CVE-2026-46028, CVE-2026-46300 (weaponized), CVE-2026-46323, CVE-2026-46333 (weaponized), CVE-2026-47326, CVE-2026-47327, CVE-2026-47328, CVE-2026-47329, CVE-2026-47330, CVE-2026-47332, CVE-2026-47333, CVE-2026-47334, CVE-2026-47337

Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0806

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