SB2022020942 - Ubuntu update for linux-oem-5.14
Published: February 9, 2022 Updated: September 19, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 21 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2022-24122)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error with in the kernel/ucount.c in Linux kernel, when unprivileged user namespaces are enabled. A local user can trigger a use-after-free error, because a ucounts object can outlive its namespace, and execute arbitrary ode with elevated privileges.
2) Security restrictions bypass (CVE-ID: CVE-2022-23222)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to availability of pointer arithmetic via certain *_OR_NULL pointer types in kernel/bpf/verifier.c in the Linux kernel. A local user can run a specially crafted program to execute arbitrary code with root privileges.
3) Use-after-free (CVE-ID: CVE-2020-27820)
The vulnerability allows a local user to execute arbitrary code with elevated privileges.
The vulnerability exists due to a use-after-free error in nouveau's postclose() handler. A local user can send specially crafted data to the system and execute arbitrary code with elevated privileges.
4) 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.
5) Resource exhaustion (CVE-ID: CVE-2021-28713)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper limits for number of events driver domains could send to other guest VMs. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.
6) Improper Resource Shutdown or Release (CVE-ID: CVE-2021-28714)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to incoming data packets for a guest in the Linux kernel's netback driver are buffered until the guest is ready to process them. A remote user can use a UDP connection on a fast interface to trigger resource exhaustion and perform a denial of service (DoS) attack.
7) Improper Resource Shutdown or Release (CVE-ID: CVE-2021-28715)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to incoming data packets for a guest in the Linux kernel's netback driver are buffered until the guest is ready to process them. A remote user can use a UDP connection on a fast interface to trigger resource exhaustion and perform a denial of service (DoS) attack.
8) Buffer overflow (CVE-ID: CVE-2021-39685)
The vulnerability allows a malicious host to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the USB subsystem in Linux kernel. A malicious USB device can trigger memory corruption and execute arbitrary code on the system.
9) Race condition (CVE-ID: CVE-2021-4001)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in kernel/bpf/syscall.c in Linux kernel ebpf. A local user can exploit the race between bpf_map_update_elem and bpf_map_freeze and modify the frozen mapped address space.
10) 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.
11) Information disclosure (CVE-ID: CVE-2021-4135)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to simulated networking device driver for the Linux kernel does not properly initialize memory in certain situations. A local user can gain unauthorized access to sensitive information (kernel memory).
12) 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.
13) Security restrictions bypass (CVE-ID: CVE-2021-4197)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to missing permissions checks within the cgroups (control groups) functionality of Linux Kernel when writing into a file descriptor. A local low privileged process can trick a higher privileged parent process into writing arbitrary data into files, which can result in denial of service or privileges escalation.
14) Out-of-bounds write (CVE-ID: CVE-2021-43975)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the hw_atl_utils_fw_rpc_wait() function in drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c in Linux kernel. A local user can attach a specially crafted device to the system, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
15) Use-after-free (CVE-ID: CVE-2021-44733)
The vulnerability allows a local user to elevate privileges on the system.
The vulnerability exists due to a use-after-free error in the drivers/tee/tee_shm.c file within the TEE subsystem in the Linux kernel. A local user can trigger a race condition in tee_shm_get_from_id during an attempt to free a shared memory object and execute arbitrary code with elevated privileges.
16) Information disclosure (CVE-ID: CVE-2021-45095)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a refcount leak within the pep_sock_accept() function in net/phonet/pep.c in the Linux kernel. A local user can gain unauthorized access to sensitive information on the system.
17) Memory leak (CVE-ID: CVE-2021-45480)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the __rds_conn_create() function in net/rds/connection.c. A local user can perform a denial of service attack.
18) Improper Handling of Exceptional Conditions (CVE-ID: CVE-2022-0264)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists in the Linux kernel's eBPF verifier when handling internal data structures. A local user can leak internal kernel memory details.
19) 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.
20) Missing initialization of resource (CVE-ID: CVE-2022-0382)
The vulnerability allows a local user to gain access to sensitive information.The vulnerability exists due to uninitialized memory in the Linux kernel's TIPC protocol subsystem. A local user can send a TIPC datagram to one or more destinations and read some kernel memory.
21) 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.