QID 198331

Date Published: 2021-04-26

QID 198331: Ubuntu Security Notification for Linux kernel (OEM) vulnerabilities (USN-4915-1)

The overlayfs implementation in the linux kernel did not properly validate the application of file system capabilities with respect to user namespaces
The shiftfs file system in the ubuntu linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system

A local attacker could use this to gain elevated privileges
(CVE-2021-3493)
A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code
(CVE-2021-3492)

CVSS V3 rated as Critical - 8.8 severity.

CVSS V2 rated as Medium - 4.1 severity.

Solution

Refer to Ubuntu advisory: USN-4915-1 for affected packages and patching details, or update with your package manager.

Vendor References

USN-4915-1 - usn.ubuntu.com/4915-1

CVEs related to QID 198331

CVE-2021-3493 | CVE-2021-3492 |

Software Advisories

Advisory ID	Software	Component	Link
USN-4915-1	Ubuntu Linux		usn.ubuntu.com/4915-1

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