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Millions of Ubuntu users vulnerable to OverlayFS module security bug
Linux kernel flaws (CVE-2023-32629, CVE-2023-2640) affect 40% of users.
More: https://nvd.nist.gov/vuln/detail/CVE-2023-2640
https://nvd.nist.gov/vuln/detail/CVE-2023-32629
CVE-2023-2640 (CVSS v3: 7.8) grants elevated privileges due to insufficient permission checks.
CVE-2023-32629 (CVSSv3: 5.4) allows execution of arbitrary code by exploiting memory management race condition. Bugs linked to OverlayFS module modifications in Ubuntu kernel. PoC exploits already public. Other Linux distributions not impacted.
Ubuntu already released patch updates for all vulnerabilities. Upgrade via package manager and reboot after installation.
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