SUSE update for the Linux Kernel



Risk Medium
Patch available YES
Number of vulnerabilities 9
CVE-ID CVE-2020-12362
CVE-2020-12363
CVE-2020-12364
CVE-2020-12373
CVE-2020-29368
CVE-2020-29374
CVE-2021-26930
CVE-2021-26931
CVE-2021-26932
CWE-ID CWE-190
CWE-20
CWE-476
CWE-119
CWE-787
CWE-362
CWE-399
CWE-770
Exploitation vector Network
Public exploit N/A
Vulnerable software
 SUSE Linux Enterprise Module for Public Cloud
Operating systems & Components / Operating system

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

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

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

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

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

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

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

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

Vendor SUSE

Security Bulletin

This security bulletin contains information about 9 vulnerabilities.

1) Integer overflow

EUVDB-ID: #VU54234

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-2020-12362

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow. A local user can run a specially crafted program to trigger integer overflow and execute arbitrary code with elevated privileges.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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) Input validation error

EUVDB-ID: #VU54248

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12363

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A local user can run a specially crafted program to perform a denial of service (DoS) attack.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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) NULL pointer dereference

EUVDB-ID: #VU54249

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12364

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error. A local user can run a specially crafted program to perform a denial of service (DoS) attack.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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.

4) Buffer overflow

EUVDB-ID: #VU50585

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-2020-12373

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 in the BMC firmware for some Intel(R) Server Boards, Server Systems and Compute Modules before version 2.47. A local privileged user can  trigger memory corruption and execute arbitrary code on the target system with elevated privileges.


Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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) Out-of-bounds write

EUVDB-ID: #VU51549

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-2020-29368

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 when processing untrusted input within the __split_huge_pmd() function in mm/huge_memory.c in the Linux kernel. A local user can abuse the copy-on-write implementation and gain unintended write access because of a race condition in a THP mapcount check.


Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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) Race condition

EUVDB-ID: #VU63812

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-29374

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in the mm/gup.c and mm/huge_memory.c in Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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) Resource management error

EUVDB-ID: #VU51587

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-26930

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources when processing service requests to the PV backend within drivers/block/xen-blkback/blkback.c driver in Xen. A local user on the guest OS can perform a denial of service (DoS) attack.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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

8) Allocation of resources without limits or throttling

EUVDB-ID: #VU92418

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26931

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to allocation of resources without limits or throttling error within the scsiback_gnttab_data_map_batch() function in drivers/xen/xen-scsiback.c. A local user can perform a denial of service (DoS) attack.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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.

9) Buffer overflow

EUVDB-ID: #VU93670

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26932

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory corruption within the gntdev_map_grant_pages() function in drivers/xen/gntdev.c. A local user can perform a denial of service (DoS) attack.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Public Cloud: 15-SP2

kernel-source-azure: before 5.3.18-18.38.1

kernel-devel-azure: before 5.3.18-18.38.1

kernel-syms-azure: before 5.3.18-18.38.1

kernel-azure-devel-debuginfo: before 5.3.18-18.38.1

kernel-azure-devel: before 5.3.18-18.38.1

kernel-azure-debugsource: before 5.3.18-18.38.1

kernel-azure-debuginfo: before 5.3.18-18.38.1

kernel-azure: before 5.3.18-18.38.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210738-1/


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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