Red Hat Enterprise Linux 8 update for kernel-rt
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2020-26541 CVE-2021-33034 |
| CWE-ID | CWE-693 CWE-416 |
| Exploitation vector | Local |
| Public exploit | N/A |
| 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 2 vulnerabilities.
1) Protection Mechanism Failure
EUVDB-ID: #VU54455
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-2020-26541
CWE-ID:
CWE-693 - Protection Mechanism Failure
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The Linux kernel through 5.8.13 does not properly enforce the Secure
Boot Forbidden Signature Database (aka dbx) protection mechanism. This
affects certs/blacklist.c and certs/system_keyring.c. A local user can escalate privileges on the system.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-80.1.2.rt9.145.el8_0 - 4.18.0-240.22.1.rt7.77.el8_3
Red Hat Enterprise Linux for Real Time for NFV: 8
Red Hat Enterprise Linux for Real Time: 8
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.56.1.rt13.106.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.51.1.rt13.101.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-240.22.1.rt7.77.el8_3:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2021:2599
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) Use-after-free
EUVDB-ID: #VU54454
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-2021-33034
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 net/bluetooth/hci_event.c when destroying an hci_chan. A local user can escalate privileges on the system.
Install updates from vendor's website.
kernel-rt (Red Hat package): 4.18.0-80.1.2.rt9.145.el8_0 - 4.18.0-240.22.1.rt7.77.el8_3
Red Hat Enterprise Linux for Real Time for NFV: 8
Red Hat Enterprise Linux for Real Time: 8
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.56.1.rt13.106.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-193.51.1.rt13.101.el8_2:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:4.18.0-240.22.1.rt7.77.el8_3:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:8:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:8:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2021:2599
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.
