QID 198332

Date Published: 2021-04-26

QID 198332: Ubuntu Security Notification for Linux kernel vulnerabilities (USN-4916-1)

The overlayfs implementation in the linux kernel did not properly validate the application of file system capabilities with respect to user namespaces
The bpf jit compiler for x86 in the linux kernel did not properly validate computation of branch displacements in some situations

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 (system crash) or possibly execute arbitrary code
(CVE-2021-29154)

CVSS V3 rated as High - 7.8 severity.

CVSS V2 rated as High - 7.2 severity.

Solution

Refer to Ubuntu advisory: USN-4916-1 for affected packages and patching details, or update with your package manager.

Vendor References

USN-4916-1 - usn.ubuntu.com/4916-1

CVEs related to QID 198332

CVE-2021-3493 | CVE-2021-29154 |

Software Advisories

Advisory ID	Software	Component	Link
USN-4916-1	Ubuntu Linux		usn.ubuntu.com/4916-1

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