Red Hat Enterprise Linux 8 update for kernel



Published: 2021-06-30
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 (Red Hat package)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server - Update Services for SAP Solutions
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions
Operating systems & Components / Operating system package or component

Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Operating systems & Components / Operating system

Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Operating systems & Components / Operating system

Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server - TUS
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Operating systems & Components / Operating system

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server - AUS
Operating systems & Components / Operating system

Red Hat Enterprise Linux for x86_64 - Extended Update Support
Operating systems & Components / Operating system

Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Operating systems & Components / Operating system

Red Hat CodeReady Linux Builder for ARM 64
Operating systems & Components / Operating system

Red Hat CodeReady Linux Builder for Power, little endian
Operating systems & Components / Operating system

Red Hat CodeReady Linux Builder for x86_64
Operating systems & Components / Operating system

Red Hat Enterprise Linux for ARM 64
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Power, little endian
Operating systems & Components / Operating system

Red Hat Enterprise Linux for IBM z Systems
Operating systems & Components / Operating system

Red Hat Enterprise Linux for x86_64
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Advisory

1) Protection Mechanism Failure

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] [PCI]

CVE-ID: CVE-2020-26541

CWE-ID: CWE-693 - Protection Mechanism Failure

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 4.18.0-80.1.2.el8_0, 4.18.0-80.4.2.el8_0, 4.18.0-80.7.1.el8_0, 4.18.0-80.7.2.el8_0, 4.18.0-80.11.1.el8_0, 4.18.0-80.11.2.el8_0, 4.18.0-80.15.1.el8_0, 4.18.0-80.16.1.el8_0, 4.18.0-80.18.1.el8_0, 4.18.0-80.23.2.el8_0, 4.18.0-147.0.2.el8_1, 4.18.0-147.0.3.el8_1, 4.18.0-147.5.1.el8_1, 4.18.0-147.8.1.el8_1, 4.18.0-147.13.2.el8_1, 4.18.0-147.34.1.el8_1, 4.18.0-147.44.1.el8_1, 4.18.0-147.el8, 4.18.0-193.6.3.el8_2, 4.18.0-193.13.2.el8_2, 4.18.0-193.40.1.el8_2, 4.18.0-193.51.1.el8_2, 4.18.0-193.56.1.el8_2, 4.18.0-193.el8, 4.18.0-240.10.1.el8_3, 4.18.0-240.22.1.el8_3

Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support: 8.4

Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support: 8.4

Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support: 8.4

Red Hat Enterprise Linux Server - Update Services for SAP Solutions: 8.4

Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions: 8.4

Red Hat Enterprise Linux Server - TUS: 8.4

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.4

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.4

Red Hat Enterprise Linux Server - AUS: 8.4

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.4

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.4

Red Hat CodeReady Linux Builder for ARM 64: 8.0

Red Hat CodeReady Linux Builder for Power, little endian: 8.0

Red Hat CodeReady Linux Builder for x86_64: 8.0

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0

CPE External links

https://access.redhat.com/errata/RHSA-2021:2570

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

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] [PCI]

CVE-ID: CVE-2021-33034

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The 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.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 4.18.0-80.1.2.el8_0, 4.18.0-80.4.2.el8_0, 4.18.0-80.7.1.el8_0, 4.18.0-80.7.2.el8_0, 4.18.0-80.11.1.el8_0, 4.18.0-80.11.2.el8_0, 4.18.0-80.15.1.el8_0, 4.18.0-80.16.1.el8_0, 4.18.0-80.18.1.el8_0, 4.18.0-80.23.2.el8_0, 4.18.0-147.0.2.el8_1, 4.18.0-147.0.3.el8_1, 4.18.0-147.5.1.el8_1, 4.18.0-147.8.1.el8_1, 4.18.0-147.13.2.el8_1, 4.18.0-147.34.1.el8_1, 4.18.0-147.44.1.el8_1, 4.18.0-147.el8, 4.18.0-193.6.3.el8_2, 4.18.0-193.13.2.el8_2, 4.18.0-193.40.1.el8_2, 4.18.0-193.51.1.el8_2, 4.18.0-193.56.1.el8_2, 4.18.0-193.el8, 4.18.0-240.10.1.el8_3, 4.18.0-240.22.1.el8_3

Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support: 8.4

Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support: 8.4

Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support: 8.4

Red Hat Enterprise Linux Server - Update Services for SAP Solutions: 8.4

Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions: 8.4

Red Hat Enterprise Linux Server - TUS: 8.4

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.4

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.4

Red Hat Enterprise Linux Server - AUS: 8.4

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.4

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.4

Red Hat CodeReady Linux Builder for ARM 64: 8.0

Red Hat CodeReady Linux Builder for Power, little endian: 8.0

Red Hat CodeReady Linux Builder for x86_64: 8.0

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0

CPE External links

https://access.redhat.com/errata/RHSA-2021:2570

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.



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