SB2022022241 - Ubuntu update for linux

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Double Free (CVE-ID: CVE-2021-22600)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in the packet_set_ring() function in net/packet/af_packet.c. A local user can pass specially crafted data to the application, trigger double free error and escalate privileges on the system.

Note, the vulnerability is being actively exploited in the wild against Android users.

2) Use-after-free (CVE-ID: CVE-2021-4083)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the Linux kernel's garbage collection for Unix domain socket file handlers. A local user can call close() and fget() simultaneously and can potentially trigger a race condition, which in turn leads to a use-after-free error and allows privilege escalation.

3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-4155)

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to the OS kernel does not impose correctly security restrictions. A local user can gain access to sensitive information on the system.

4) Buffer overflow (CVE-ID: CVE-2022-0330)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a random memory access flaw caused by a missing TLB flush in Linux kernel GPU i915 kernel driver functionality. A local user can execute arbitrary code on the system with elevated privileges.

5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-22942)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in the vmwgfx driver in Linux kernel. A local unprivileged user can gain access to files opened by other processes on the system through a dangling 'file' pointer.

Exploiting this vulnerability requires an attacker to have access to either /dev/dri/card0 or /dev/dri/rendererD128 and be able to issue an ioctl() on the resulting file descriptor.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-5295-2