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Vulnerability record · CVE-2023-2640 · published 26 July 2023

CVE-2023-2640: Canonical ubuntu linux incorrect authorization vulnerability

Canonical · Ubuntu Linux

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.

7.8 CVSS 3.1 High EPSS 15% · top 3.4% CWE-863 · Incorrect authorization
7.8CVSS 3.1 base score
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2023-2640), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.