CVE-2023-32629 — Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up

Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip permission checks when calling ovl_do_setxattr on Ubuntu kernels

01What is this vulnerability?

Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip permission checks when calling ovl_do_setxattr on Ubuntu kernels

02Affected products

Vendor	Product	Versions
Canonical	Ubuntu Kernel	0, 0, 0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-07-26T01:59:47.061Z
• Last modified: 2025-02-13T16:54:52.620Z

09References

• ubuntu.com — https://ubuntu.com/security/notices/USN-6250-1
• lists.ubuntu.com — https://lists.ubuntu.com/archives/kernel-team/2023-July/140920.html
• wiz.io — https://wiz.io/blog/ubuntu-overlayfs-vulnerability
• cve.mitre.org — https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32629
• packetstormsecurity.com — http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LS…