SUSE update for the Linux Kernel



Risk Medium
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2021-21781
CVE-2021-22543
CVE-2021-3659
CVE-2021-37576
CWE-ID CWE-200
CWE-119
CWE-476
CWE-787
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 SUSE Linux Enterprise Module for Public Cloud
Operating systems & Components / Operating system

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

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 4 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU54395

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-21781

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

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

The vulnerability exists due to excessive data output in the ARM SIGPAGE functionality. A userland application can read the contents of the sigpage, which can leak kernel memory contents.

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-syms-azure: before 5.3.18-18.61.1

kernel-azure-devel-debuginfo: before 5.3.18-18.61.1

kernel-azure-devel: before 5.3.18-18.61.1

kernel-azure-debugsource: before 5.3.18-18.61.1

kernel-azure-debuginfo: before 5.3.18-18.61.1

kernel-azure: before 5.3.18-18.61.1

kernel-source-azure: before 5.3.18-18.61.1

kernel-devel-azure: before 5.3.18-18.61.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212646-1/


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) 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 Module for Public Cloud: 15-SP2

kernel-syms-azure: before 5.3.18-18.61.1

kernel-azure-devel-debuginfo: before 5.3.18-18.61.1

kernel-azure-devel: before 5.3.18-18.61.1

kernel-azure-debugsource: before 5.3.18-18.61.1

kernel-azure-debuginfo: before 5.3.18-18.61.1

kernel-azure: before 5.3.18-18.61.1

kernel-source-azure: before 5.3.18-18.61.1

kernel-devel-azure: before 5.3.18-18.61.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212646-1/


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.

3) 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 Module for Public Cloud: 15-SP2

kernel-syms-azure: before 5.3.18-18.61.1

kernel-azure-devel-debuginfo: before 5.3.18-18.61.1

kernel-azure-devel: before 5.3.18-18.61.1

kernel-azure-debugsource: before 5.3.18-18.61.1

kernel-azure-debuginfo: before 5.3.18-18.61.1

kernel-azure: before 5.3.18-18.61.1

kernel-source-azure: before 5.3.18-18.61.1

kernel-devel-azure: before 5.3.18-18.61.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212646-1/


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) 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 Module for Public Cloud: 15-SP2

kernel-syms-azure: before 5.3.18-18.61.1

kernel-azure-devel-debuginfo: before 5.3.18-18.61.1

kernel-azure-devel: before 5.3.18-18.61.1

kernel-azure-debugsource: before 5.3.18-18.61.1

kernel-azure-debuginfo: before 5.3.18-18.61.1

kernel-azure: before 5.3.18-18.61.1

kernel-source-azure: before 5.3.18-18.61.1

kernel-devel-azure: before 5.3.18-18.61.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212646-1/


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.



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