SUSE update for the Linux Kernel



Risk Medium
Patch available YES
Number of vulnerabilities 6
CVE-ID CVE-2021-0941
CVE-2021-20322
CVE-2021-31916
CVE-2021-34981
CVE-2021-37159
CVE-2021-3772
CWE-ID CWE-125
CWE-330
CWE-787
CWE-415
CWE-345
Exploitation vector Network
Public exploit N/A
Vulnerable software
 SUSE Linux Enterprise Server
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
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

Vendor SUSE

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) 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 Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-source-azure: before 4.12.14-16.80.1

kernel-devel-azure: before 4.12.14-16.80.1

kernel-syms-azure: before 4.12.14-16.80.1

kernel-azure-devel: before 4.12.14-16.80.1

kernel-azure-debugsource: before 4.12.14-16.80.1

kernel-azure-debuginfo: before 4.12.14-16.80.1

kernel-azure-base-debuginfo: before 4.12.14-16.80.1

kernel-azure-base: before 4.12.14-16.80.1

kernel-azure: before 4.12.14-16.80.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213848-1/


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) 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 Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-source-azure: before 4.12.14-16.80.1

kernel-devel-azure: before 4.12.14-16.80.1

kernel-syms-azure: before 4.12.14-16.80.1

kernel-azure-devel: before 4.12.14-16.80.1

kernel-azure-debugsource: before 4.12.14-16.80.1

kernel-azure-debuginfo: before 4.12.14-16.80.1

kernel-azure-base-debuginfo: before 4.12.14-16.80.1

kernel-azure-base: before 4.12.14-16.80.1

kernel-azure: before 4.12.14-16.80.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213848-1/


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.

3) 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 Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-source-azure: before 4.12.14-16.80.1

kernel-devel-azure: before 4.12.14-16.80.1

kernel-syms-azure: before 4.12.14-16.80.1

kernel-azure-devel: before 4.12.14-16.80.1

kernel-azure-debugsource: before 4.12.14-16.80.1

kernel-azure-debuginfo: before 4.12.14-16.80.1

kernel-azure-base-debuginfo: before 4.12.14-16.80.1

kernel-azure-base: before 4.12.14-16.80.1

kernel-azure: before 4.12.14-16.80.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213848-1/


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) 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 Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-source-azure: before 4.12.14-16.80.1

kernel-devel-azure: before 4.12.14-16.80.1

kernel-syms-azure: before 4.12.14-16.80.1

kernel-azure-devel: before 4.12.14-16.80.1

kernel-azure-debugsource: before 4.12.14-16.80.1

kernel-azure-debuginfo: before 4.12.14-16.80.1

kernel-azure-base-debuginfo: before 4.12.14-16.80.1

kernel-azure-base: before 4.12.14-16.80.1

kernel-azure: before 4.12.14-16.80.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213848-1/


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: #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 Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-source-azure: before 4.12.14-16.80.1

kernel-devel-azure: before 4.12.14-16.80.1

kernel-syms-azure: before 4.12.14-16.80.1

kernel-azure-devel: before 4.12.14-16.80.1

kernel-azure-debugsource: before 4.12.14-16.80.1

kernel-azure-debuginfo: before 4.12.14-16.80.1

kernel-azure-base-debuginfo: before 4.12.14-16.80.1

kernel-azure-base: before 4.12.14-16.80.1

kernel-azure: before 4.12.14-16.80.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213848-1/


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) Insufficient verification of data authenticity

EUVDB-ID: #VU63835

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3772

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service attack (DoS) on the target system.

The vulnerability exists due to insufficient verification of data authenticity in the Linux SCTP stack. A remote attacker can exploit this vulnerability to perform a denial of service attack.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP5

kernel-source-azure: before 4.12.14-16.80.1

kernel-devel-azure: before 4.12.14-16.80.1

kernel-syms-azure: before 4.12.14-16.80.1

kernel-azure-devel: before 4.12.14-16.80.1

kernel-azure-debugsource: before 4.12.14-16.80.1

kernel-azure-debuginfo: before 4.12.14-16.80.1

kernel-azure-base-debuginfo: before 4.12.14-16.80.1

kernel-azure-base: before 4.12.14-16.80.1

kernel-azure: before 4.12.14-16.80.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213848-1/


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.



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