SUSE update for the Linux Kernel

Published: 2021-08-10

Risk	Medium
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2020-0429 CVE-2020-36386 CVE-2021-22543 CVE-2021-3659 CVE-2021-37576
CWE-ID	CWE-416 CWE-125 CWE-119 CWE-476 CWE-787
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #3 is available.
Vulnerable software	SUSE Linux Enterprise Server Operating systems & Components / Operating system kernel-syms-azure 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-base-debuginfo Operating systems & Components / Operating system package or component kernel-azure-base Operating systems & Components / Operating system package or component kernel-azure Operating systems & Components / Operating system package or component kernel-source-azure Operating systems & Components / Operating system package or component kernel-devel-azure Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU47047

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-2020-0429

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local privileged user to execute arbitrary code.

In l2tp_session_delete and related functions of l2tp_core.c, there is possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-152735806

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-syms-azure: before 4.12.14-16.68.1

kernel-azure-devel: before 4.12.14-16.68.1

kernel-azure-debugsource: before 4.12.14-16.68.1

kernel-azure-debuginfo: before 4.12.14-16.68.1

kernel-azure-base-debuginfo: before 4.12.14-16.68.1

kernel-azure-base: before 4.12.14-16.68.1

kernel-azure: before 4.12.14-16.68.1

kernel-source-azure: before 4.12.14-16.68.1

kernel-devel-azure: before 4.12.14-16.68.1

CPE2.3

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212644-1/

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: #VU59125

Risk: Low

CVSSv4.0: 4.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-36386

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition within the hci_extended_inquiry_result_evt() function in Linux kernel. A local user can tun a specially crafted program to trigger an out-of-bounds read error and read contents of memory on the system or crash the kernel.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-syms-azure: before 4.12.14-16.68.1

kernel-azure-devel: before 4.12.14-16.68.1

kernel-azure-debugsource: before 4.12.14-16.68.1

kernel-azure-debuginfo: before 4.12.14-16.68.1

kernel-azure-base-debuginfo: before 4.12.14-16.68.1

kernel-azure-base: before 4.12.14-16.68.1

kernel-azure: before 4.12.14-16.68.1

kernel-source-azure: before 4.12.14-16.68.1

kernel-devel-azure: before 4.12.14-16.68.1

CPE2.3

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212644-1/

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) Buffer overflow

EUVDB-ID: #VU56018

Risk: Low

CVSSv4.0: 7.1 [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:P/U:Clear]

CVE-ID: CVE-2021-22543

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in Linux kernel when handling VM_IO|VM_PFNMAP vmas in KVM. A local user can can bypass RO checks and cause the pages to get freed while still accessible by the VMM and guest. As a result, an attacker with the ability to start and control a VM to read/write random pages of memory, can trigger memory corruption 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 Server: 12-SP5

kernel-syms-azure: before 4.12.14-16.68.1

kernel-azure-devel: before 4.12.14-16.68.1

kernel-azure-debugsource: before 4.12.14-16.68.1

kernel-azure-debuginfo: before 4.12.14-16.68.1

kernel-azure-base-debuginfo: before 4.12.14-16.68.1

kernel-azure-base: before 4.12.14-16.68.1

kernel-azure: before 4.12.14-16.68.1

kernel-source-azure: before 4.12.14-16.68.1

kernel-devel-azure: before 4.12.14-16.68.1

CPE2.3

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212644-1/

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. However, proof of concept for this vulnerability is available.

4) NULL pointer dereference

EUVDB-ID: #VU74547

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-2021-3659

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in the way the user closes the LR-WPAN connection within the IEEE 802.15.4 wireless networking subsystem. 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 Server: 12-SP5

kernel-syms-azure: before 4.12.14-16.68.1

kernel-azure-devel: before 4.12.14-16.68.1

kernel-azure-debugsource: before 4.12.14-16.68.1

kernel-azure-debuginfo: before 4.12.14-16.68.1

kernel-azure-base-debuginfo: before 4.12.14-16.68.1

kernel-azure-base: before 4.12.14-16.68.1

kernel-azure: before 4.12.14-16.68.1

kernel-source-azure: before 4.12.14-16.68.1

kernel-devel-azure: before 4.12.14-16.68.1

CPE2.3

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212644-1/

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: #VU57101

Risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-37576

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform. An attacker on KVM guest OS can cause host OS memory corruption via rtas_args.nargs and execute arbitrary code on the host OS.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-syms-azure: before 4.12.14-16.68.1

kernel-azure-devel: before 4.12.14-16.68.1

kernel-azure-debugsource: before 4.12.14-16.68.1

kernel-azure-debuginfo: before 4.12.14-16.68.1

kernel-azure-base-debuginfo: before 4.12.14-16.68.1

kernel-azure-base: before 4.12.14-16.68.1

kernel-azure: before 4.12.14-16.68.1

kernel-source-azure: before 4.12.14-16.68.1

kernel-devel-azure: before 4.12.14-16.68.1

CPE2.3

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212644-1/

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.