Red Hat Linux for Real Time 8.2 update for kernel-rt
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-0920 CVE-2021-4155 CVE-2021-4028 |
| CWE-ID | CWE-416 CWE-264 |
| Exploitation vector | Local |
| Public exploit | Vulnerability #1 is being exploited in the wild. |
| Vulnerable software Subscribe |
kernel-rt (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Enterprise Linux for Real Time for NFV Operating systems & Components / Operating system Red Hat Enterprise Linux for Real Time Operating systems & Components / Operating system |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Use-after-free
EUVDB-ID: #VU59811
Risk: Low
CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]
CVE-ID: CVE-2021-0920
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the unix_scm_to_skb() function of af_unix.c in Linux kernel. A local user can run a specially crafted program to trigger a race condition and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.71.1.rt13.121.el8_2
Red Hat Enterprise Linux for Real Time for NFV: 8.2
Red Hat Enterprise Linux for Real Time: 8.2
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.71.1.rt13.121.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.70.1.rt13.120.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.68.1.rt13.118.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8.2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8.2:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:0629
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
2) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU59812
Risk: Low
CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4155
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe 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.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.71.1.rt13.121.el8_2
Red Hat Enterprise Linux for Real Time for NFV: 8.2
Red Hat Enterprise Linux for Real Time: 8.2
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.71.1.rt13.121.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.70.1.rt13.120.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.68.1.rt13.118.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8.2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8.2:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:0629
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Use-after-free
EUVDB-ID: #VU60797
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4028
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the RDMA listen()
function in Linux kernel. A local user can run a specially crafted program to trigger a use-after-free error and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.71.1.rt13.121.el8_2
Red Hat Enterprise Linux for Real Time for NFV: 8.2
Red Hat Enterprise Linux for Real Time: 8.2
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.71.1.rt13.121.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.70.1.rt13.120.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.68.1.rt13.118.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8.2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8.2:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:0629
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
