Red Hat Enterprise Linux for Real Time 8.2 update for kernel-rt



Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2021-3347
CVE-2021-27363
CVE-2021-27364
CVE-2021-27365
CWE-ID CWE-416
CWE-200
CWE-264
CWE-119
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		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

kernel-rt (Red Hat package)
Operating systems & Components / Operating system package or component

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU52035

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-2021-3347

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to elevate privileges on the system.

The vulnerability exists due to a use-after-free error when handling PI futexes. A local user can run a specially crafted program to trigger a use-after-free error and execute arbitrary code with elevated privileges.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Real Time for NFV: 8.2

Red Hat Enterprise Linux for Real Time: 8.2

kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.40.1.rt13.90.el8_2

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1279


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) Information disclosure

EUVDB-ID: #VU51453

Risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-27363

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the show_transport_handle() shows iSCSI transport handle to non-root users. A local user can gain unauthorized access to sensitive information and use it along with another vulnerability, such as #VU51452, to escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Real Time for NFV: 8.2

Red Hat Enterprise Linux for Real Time: 8.2

kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.40.1.rt13.90.el8_2

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1279


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) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU51452

Risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-27364

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to iscsi_if_recv_msg() allows non-root users to connect and send commands to the Linux kernel. A local user can escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Real Time for NFV: 8.2

Red Hat Enterprise Linux for Real Time: 8.2

kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.40.1.rt13.90.el8_2

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1279


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.

4) Buffer overflow

EUVDB-ID: #VU51451

Risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-27365

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when processing Netlink messages in Linux kernel through 5.11.3, as certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. A local unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message, trigger memory corruption and execute arbitrary code on the system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Real Time for NFV: 8.2

Red Hat Enterprise Linux for Real Time: 8.2

kernel-rt (Red Hat package): 4.18.0-193.1.2.rt13.53.el8_2 - 4.18.0-193.40.1.rt13.90.el8_2

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1279


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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