What’s Vulnerable › Vulnerabilities

CVE-2023-2640

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 15.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-07-26 · updated 2026-06-17
• Weakness: CWE-863

Description

On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.

Affected products

• Canonical Ubuntu Linux: 23.04

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640
• https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html
• https://ubuntu.com/security/notices/USN-6250-1
• https://wiz.io/blog/ubuntu-overlayfs-vulnerability
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640
• https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html
• https://ubuntu.com/security/notices/USN-6250-1
• https://wiz.io/blog/ubuntu-overlayfs-vulnerability

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