A flaw was found in the Linux kernel, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux
Affects the Linux kernel where a local user is permitted to mount overlay mounts in user namespaces. Fixed in kernel 5.10.179-1.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 5.10.179-1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The Linux kernel's OverlayFS subsystem is affected. A local user can exploit this flaw to gain elevated privileges on the affected system.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A flaw was found in the Linux kernel, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux kernel’s OverlayFS subsystem in how a user copies a capable file from a nosuid mount into another mount. This uid mapping bug allows a local user to escalate their privileges on the system.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- n/a Kernel
Linux kernel 6.2-rc6
References 6
security.netapp.com
debian.org
packetstormsecurity.com
Questions about CVE-2023-0386
What does this mean?
The kernel wrongly allows unauthorized execution of setuid files that carry capabilities. A local user can use this flaw for local privilege escalation.Source: lists.debian.org
Am I affected, and how do I check?
The flaw involves the Linux kernel and requires a local user who is permitted to mount overlay mounts in user namespaces. To check a system's kernel version, run uname -r and compare it with the fixed version, 5.10.179-1.Source: lists.debian.org
What should I do about it?
Update the Linux kernel to 5.10.179-1 or later, which contains the fix.Source: lists.debian.org
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-06-17, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data