CVE-2023-2640

moderate-risk
Published 2023-07-26

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.

Do I need to act?

!
91.5% chance of exploitation in next 30 days
EPSS score — higher than 8% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Canonical

References (8)

Third Party Advisory https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640
Mailing List https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html
Vendor Advisory https://ubuntu.com/security/notices/USN-6250-1
Exploit https://wiz.io/blog/ubuntu-overlayfs-vulnerability
Third Party Advisory https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640
Mailing List https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html
Vendor Advisory https://ubuntu.com/security/notices/USN-6250-1
Exploit https://wiz.io/blog/ubuntu-overlayfs-vulnerability
49
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 20/34 · Moderate
Exposure 5/34 · Minimal