SUSE update for the Linux Kernel (Live Patch 37 for SLE 12 SP3)

Published: 2021-06-04

Risk	Low
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2020-36322 CVE-2021-28950 CVE-2021-29154
CWE-ID	CWE-404 CWE-834 CWE-77
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	SUSE Linux Enterprise Server for SAP Operating systems & Components / Operating system SUSE Linux Enterprise Server Operating systems & Components / Operating system kgraft-patch-4_4_180-94_141-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_141-default Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_138-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_138-default Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Improper Resource Shutdown or Release

EUVDB-ID: #VU59473

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-36322

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

Exploit availability: No

Description

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

The vulnerability exists in the FUSE filesystem implementation in the Linux kernel due to fuse_do_getattr() calls make_bad_inode() in inappropriate situations. A local user can run a specially crafted program to trigger kernel crash.

Note, the vulnerability exists due to incomplete fix for #VU58207 (CVE-2021-28950).

Mitigation

Update the affected package the Linux Kernel (Live Patch 37 for SLE 12 SP3) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server for SAP: 12-SP3

SUSE Linux Enterprise Server: 12-SP3-LTSS

kgraft-patch-4_4_180-94_141-default-debuginfo: before 4-2.2

kgraft-patch-4_4_180-94_141-default: before 4-2.2

kgraft-patch-4_4_180-94_138-default-debuginfo: before 5-2.2

kgraft-patch-4_4_180-94_138-default: before 5-2.2

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20211870-1/

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) Excessive Iteration

EUVDB-ID: #VU58207

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28950

CWE-ID: CWE-834 - Excessive Iteration

Exploit availability: No

Description

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

The vulnerability exists due to excessive iteration in fs/fuse/fuse_i.h in the Linux kernel. A local user can run a specially crafted program to perform a denial of service attack.

Mitigation

Update the affected package the Linux Kernel (Live Patch 37 for SLE 12 SP3) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server for SAP: 12-SP3

SUSE Linux Enterprise Server: 12-SP3-LTSS

kgraft-patch-4_4_180-94_141-default-debuginfo: before 4-2.2

kgraft-patch-4_4_180-94_141-default: before 4-2.2

kgraft-patch-4_4_180-94_138-default-debuginfo: before 5-2.2

kgraft-patch-4_4_180-94_138-default: before 5-2.2

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20211870-1/

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) Command Injection

EUVDB-ID: #VU56241

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29154

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

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

The vulnerability exists due to incorrect computation of branch displacements within the BPF JIT compilers in the Linux kernel in arch/x86/net/bpf_jit_comp.c and arch/x86/net/bpf_jit_comp32.c. A local user can inject and execute arbitrary commands with elevated privileges.

Mitigation

Update the affected package the Linux Kernel (Live Patch 37 for SLE 12 SP3) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server for SAP: 12-SP3

SUSE Linux Enterprise Server: 12-SP3-LTSS

kgraft-patch-4_4_180-94_141-default-debuginfo: before 4-2.2

kgraft-patch-4_4_180-94_141-default: before 4-2.2

kgraft-patch-4_4_180-94_138-default-debuginfo: before 5-2.2

kgraft-patch-4_4_180-94_138-default: before 5-2.2

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20211870-1/

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.