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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.46% probability · 39th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-281
- Affected
- linux/linux kernel · fedoraproject/fedora
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2009704Issue Tracking, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/10/14/3Mailing List, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2009704Issue Tracking, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/10/14/3Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.