Vulnerability in Linux Kernel
CVE-2021-3847
An unauthorized access to the execution of the setuid file with capabilities flaw in the Linux kernel OverlayFS subsystem was found in the way user copying a capable file from a nosuid mount into another mount. A local user could use this flaw to escalate their privileges on the system.
EPSS: 0.005 (37.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Linux_kernel
- Fedoraproject Fedora — versions 34
- N/a Kernel — versions all versions up to, including, kernel 5.17
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Mailing List, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-3847?
- CVE-2021-3847 is a high-severity vulnerability in Linux Kernel, classified under Improper Preservation of Permissions. CVSS score: 7.8/10. Published 2022-04-01.
- How severe is CVE-2021-3847?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-3847 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.