SUSE update for the Linux RT Kernel



Risk Medium
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2020-27820
CVE-2021-0941
CVE-2021-20322
CVE-2021-31916
CVE-2021-34981
CVE-2021-37159
CVE-2021-43389
CWE-ID CWE-416
CWE-125
CWE-330
CWE-787
CWE-415
CWE-129
Exploitation vector Network
Public exploit N/A
Vulnerable software
SUSE Linux Enterprise Module for Realtime
Operating systems & Components / Operating system

SUSE MicroOS
Operating systems & Components / Operating system

kernel-source-rt
Operating systems & Components / Operating system package or component

kernel-devel-rt
Operating systems & Components / Operating system package or component

ocfs2-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

ocfs2-kmp-rt
Operating systems & Components / Operating system package or component

kernel-syms-rt
Operating systems & Components / Operating system package or component

kernel-rt_debug-devel-debuginfo
Operating systems & Components / Operating system package or component

kernel-rt_debug-devel
Operating systems & Components / Operating system package or component

kernel-rt_debug-debugsource
Operating systems & Components / Operating system package or component

kernel-rt_debug-debuginfo
Operating systems & Components / Operating system package or component

kernel-rt_debug
Operating systems & Components / Operating system package or component

kernel-rt-devel-debuginfo
Operating systems & Components / Operating system package or component

kernel-rt-devel
Operating systems & Components / Operating system package or component

gfs2-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

gfs2-kmp-rt
Operating systems & Components / Operating system package or component

dlm-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

dlm-kmp-rt
Operating systems & Components / Operating system package or component

cluster-md-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

cluster-md-kmp-rt
Operating systems & Components / Operating system package or component

kernel-rt-debugsource
Operating systems & Components / Operating system package or component

kernel-rt-debuginfo
Operating systems & Components / Operating system package or component

kernel-rt
Operating systems & Components / Operating system package or component

Vendor SUSE

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU63322

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-27820

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code with elevated privileges.

The vulnerability exists due to a use-after-free error in nouveau's postclose() handler. A local user can send specially crafted data to the system and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


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) Out-of-bounds read

EUVDB-ID: #VU64702

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-0941

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists in __bpf_skb_max_len() function in net/core/filter.c in the Linux kernel. A local user with special privilege can gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


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 of insufficiently random values

EUVDB-ID: #VU63839

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20322

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error when processing received ICMP errors. A remote attacker can effectively bypass the source port UDP randomization to gain access to sensitive information.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Out-of-bounds write

EUVDB-ID: #VU63574

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31916

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module. A special user (CAP_SYS_ADMIN) can trigger a buffer overflow in the ioctl for listing devices and escalate privileges on the system.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


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.

5) Double Free

EUVDB-ID: #VU77325

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-34981

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within the CMTP module in Linux kernel. A local user can trigger a double free error and execute arbitrary code on the system.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


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.

6) Double Free

EUVDB-ID: #VU63575

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-37159

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to hso_free_net_device() function in drivers/net/usb/hso.c in the Linux kernel calls unregister_netdev without checking for the NETREG_REGISTERED state. A local user can trigger double free and use-after-free errors and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


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.

7) Improper Validation of Array Index

EUVDB-ID: #VU63385

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-43389

CWE-ID: CWE-129 - Improper Validation of Array Index

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code with elevated privileges.

The vulnerability exists due to improper validation of array index in the ISDN CAPI implementation within detach_capi_ctr() function in drivers/isdn/capi/kcapi.c. local user can send specially crafted data to the system and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package the Linux RT Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

SUSE MicroOS: 5.0

kernel-source-rt: before 5.3.18-62.3

kernel-devel-rt: before 5.3.18-62.3

ocfs2-kmp-rt-debuginfo: before 5.3.18-62.2

ocfs2-kmp-rt: before 5.3.18-62.2

kernel-syms-rt: before 5.3.18-62.1

kernel-rt_debug-devel-debuginfo: before 5.3.18-62.3

kernel-rt_debug-devel: before 5.3.18-62.3

kernel-rt_debug-debugsource: before 5.3.18-62.3

kernel-rt_debug-debuginfo: before 5.3.18-62.3

kernel-rt_debug: before 5.3.18-62.3

kernel-rt-devel-debuginfo: before 5.3.18-62.2

kernel-rt-devel: before 5.3.18-62.2

gfs2-kmp-rt-debuginfo: before 5.3.18-62.2

gfs2-kmp-rt: before 5.3.18-62.2

dlm-kmp-rt-debuginfo: before 5.3.18-62.2

dlm-kmp-rt: before 5.3.18-62.2

cluster-md-kmp-rt-debuginfo: before 5.3.18-62.2

cluster-md-kmp-rt: before 5.3.18-62.2

kernel-rt-debugsource: before 5.3.18-62.2

kernel-rt-debuginfo: before 5.3.18-62.2

kernel-rt: before 5.3.18-62.2

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213978-1/


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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