Red Hat Enterprise Linux for Real Time 8.4 update for kernel-rt
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-4083 CVE-2022-25636 CVE-2022-0492 |
| CWE-ID | CWE-416 CWE-122 CWE-264 |
| Exploitation vector | Local |
| Public exploit |
Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. |
| Vulnerable software Subscribe |
kernel-rt (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Enterprise Linux for Real Time Operating systems & Components / Operating system Red Hat Enterprise Linux for Real Time for NFV 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: #VU61246
Risk: Low
CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4083
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 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.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-305.7.1.rt7.79.el8_4 - 4.18.0-305.40.2.rt7.113.el8_4
Red Hat Enterprise Linux for Real Time: 8.4
Red Hat Enterprise Linux for Real Time for NFV: 8.4
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.40.2.rt7.113.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.40.1.rt7.112.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.34.2.rt7.107.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8.4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8.4:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:1413
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.
2) Heap-based buffer overflow
EUVDB-ID: #VU61271
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2022-25636
CWE-ID:
CWE-122 - Heap-based Buffer Overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in net/netfilter/nf_dup_netdev.c in the Linux kernel, related to nf_tables_offload. A local user can trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-305.7.1.rt7.79.el8_4 - 4.18.0-305.40.2.rt7.113.el8_4
Red Hat Enterprise Linux for Real Time: 8.4
Red Hat Enterprise Linux for Real Time for NFV: 8.4
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.40.2.rt7.113.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.40.1.rt7.112.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.34.2.rt7.107.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8.4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8.4:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:1413
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. However, proof of concept for this vulnerability is available.
3) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU61245
Risk: Low
CVSSv3.1: 7.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]
CVE-ID: CVE-2022-0492
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a logic error within the cgroup_release_agent_write() function in kernel/cgroup/cgroup-v1.c. A local user can use the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation.
MitigationInstall updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-305.7.1.rt7.79.el8_4 - 4.18.0-305.40.2.rt7.113.el8_4
Red Hat Enterprise Linux for Real Time: 8.4
Red Hat Enterprise Linux for Real Time for NFV: 8.4
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.40.2.rt7.113.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.40.1.rt7.112.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-305.34.2.rt7.107.el8_4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8.4:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8.4:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:1413
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. However, a fully functional exploit for this vulnerability is available.
