SUSE update for the Linux Kernel



| Updated: 2024-02-08
Risk Medium
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2021-22555
CVE-2021-35039
CVE-2021-3609
CVE-2021-3612
CWE-ID CWE-787
CWE-347
CWE-362
Exploitation vector Local
Public exploit Vulnerability #1 is being exploited in the wild.
Public exploit code for vulnerability #3 is available.
Vulnerable software
SUSE Linux Enterprise Module for Realtime
Operating systems & Components / Operating system

ocfs2-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

ocfs2-kmp-rt
Operating systems & Components / Operating system package or component

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

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

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

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

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

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

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

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

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

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

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

gfs2-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

gfs2-kmp-rt
Operating systems & Components / Operating system package or component

dlm-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

dlm-kmp-rt
Operating systems & Components / Operating system package or component

cluster-md-kmp-rt-debuginfo
Operating systems & Components / Operating system package or component

cluster-md-kmp-rt
Operating systems & Components / Operating system package or component

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

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

Vendor SUSE

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU56017

Risk: Low

CVSSv4.0: 8.5 [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:A/U:Clear]

CVE-ID: CVE-2021-22555

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

Exploit availability: Yes

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 in net/netfilter/x_tables.c in Linux kernel. A local user can run a specially crafted program to trigger an out-of-bounds write 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 Realtime: 15-SP2

ocfs2-kmp-rt-debuginfo: before 5.3.18-45.3

ocfs2-kmp-rt: before 5.3.18-45.3

kernel-syms-rt: before 5.3.18-45.2

kernel-rt_debug-devel-debuginfo: before 5.3.18-45.3

kernel-rt_debug-devel: before 5.3.18-45.3

kernel-rt_debug-debugsource: before 5.3.18-45.3

kernel-rt_debug-debuginfo: before 5.3.18-45.3

kernel-rt_debug: before 5.3.18-45.3

kernel-rt-devel-debuginfo: before 5.3.18-45.3

kernel-rt-devel: before 5.3.18-45.3

kernel-rt-debugsource: before 5.3.18-45.3

kernel-rt-debuginfo: before 5.3.18-45.3

kernel-rt: before 5.3.18-45.3

gfs2-kmp-rt-debuginfo: before 5.3.18-45.3

gfs2-kmp-rt: before 5.3.18-45.3

dlm-kmp-rt-debuginfo: before 5.3.18-45.3

dlm-kmp-rt: before 5.3.18-45.3

cluster-md-kmp-rt-debuginfo: before 5.3.18-45.3

cluster-md-kmp-rt: before 5.3.18-45.3

kernel-source-rt: before 5.3.18-45.3

kernel-devel-rt: before 5.3.18-45.3

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20212599-1/


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?

Yes. This vulnerability is being exploited in the wild.

2) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU66477

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-2021-35039

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

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

The vulnerability exists due to improper signature handling in the kernel/module.c in Linux kernel. If the kernel module is not signed, it still can be loaded into the system via init_module if module.sig_enforce=1 command-line argument is used. As a result, a local user can load unsigned and potentially malicious kernel modules.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

ocfs2-kmp-rt-debuginfo: before 5.3.18-45.3

ocfs2-kmp-rt: before 5.3.18-45.3

kernel-syms-rt: before 5.3.18-45.2

kernel-rt_debug-devel-debuginfo: before 5.3.18-45.3

kernel-rt_debug-devel: before 5.3.18-45.3

kernel-rt_debug-debugsource: before 5.3.18-45.3

kernel-rt_debug-debuginfo: before 5.3.18-45.3

kernel-rt_debug: before 5.3.18-45.3

kernel-rt-devel-debuginfo: before 5.3.18-45.3

kernel-rt-devel: before 5.3.18-45.3

kernel-rt-debugsource: before 5.3.18-45.3

kernel-rt-debuginfo: before 5.3.18-45.3

kernel-rt: before 5.3.18-45.3

gfs2-kmp-rt-debuginfo: before 5.3.18-45.3

gfs2-kmp-rt: before 5.3.18-45.3

dlm-kmp-rt-debuginfo: before 5.3.18-45.3

dlm-kmp-rt: before 5.3.18-45.3

cluster-md-kmp-rt-debuginfo: before 5.3.18-45.3

cluster-md-kmp-rt: before 5.3.18-45.3

kernel-source-rt: before 5.3.18-45.3

kernel-devel-rt: before 5.3.18-45.3

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20212599-1/


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) Race condition

EUVDB-ID: #VU54292

Risk: Medium

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:Green]

CVE-ID: CVE-2021-3609

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 escalate privileges on the system.

The vulnerability exists due to a race condition in the CAN BCM networking protocol (net/can/bcm.c) in the Linux kernel ranging from version 2.6.25 to mainline 5.13-rc6. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

ocfs2-kmp-rt-debuginfo: before 5.3.18-45.3

ocfs2-kmp-rt: before 5.3.18-45.3

kernel-syms-rt: before 5.3.18-45.2

kernel-rt_debug-devel-debuginfo: before 5.3.18-45.3

kernel-rt_debug-devel: before 5.3.18-45.3

kernel-rt_debug-debugsource: before 5.3.18-45.3

kernel-rt_debug-debuginfo: before 5.3.18-45.3

kernel-rt_debug: before 5.3.18-45.3

kernel-rt-devel-debuginfo: before 5.3.18-45.3

kernel-rt-devel: before 5.3.18-45.3

kernel-rt-debugsource: before 5.3.18-45.3

kernel-rt-debuginfo: before 5.3.18-45.3

kernel-rt: before 5.3.18-45.3

gfs2-kmp-rt-debuginfo: before 5.3.18-45.3

gfs2-kmp-rt: before 5.3.18-45.3

dlm-kmp-rt-debuginfo: before 5.3.18-45.3

dlm-kmp-rt: before 5.3.18-45.3

cluster-md-kmp-rt-debuginfo: before 5.3.18-45.3

cluster-md-kmp-rt: before 5.3.18-45.3

kernel-source-rt: before 5.3.18-45.3

kernel-devel-rt: before 5.3.18-45.3

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20212599-1/


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) Out-of-bounds write

EUVDB-ID: #VU55231

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3612

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 joystick devices subsystem in Linux kernel. A local user can make a specially crafted JSIOCSBTNMAP IOCTL call, trigger out-of-bounds write and execute arbitrary code with escalated privileges.

Mitigation

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

Vulnerable software versions

SUSE Linux Enterprise Module for Realtime: 15-SP2

ocfs2-kmp-rt-debuginfo: before 5.3.18-45.3

ocfs2-kmp-rt: before 5.3.18-45.3

kernel-syms-rt: before 5.3.18-45.2

kernel-rt_debug-devel-debuginfo: before 5.3.18-45.3

kernel-rt_debug-devel: before 5.3.18-45.3

kernel-rt_debug-debugsource: before 5.3.18-45.3

kernel-rt_debug-debuginfo: before 5.3.18-45.3

kernel-rt_debug: before 5.3.18-45.3

kernel-rt-devel-debuginfo: before 5.3.18-45.3

kernel-rt-devel: before 5.3.18-45.3

kernel-rt-debugsource: before 5.3.18-45.3

kernel-rt-debuginfo: before 5.3.18-45.3

kernel-rt: before 5.3.18-45.3

gfs2-kmp-rt-debuginfo: before 5.3.18-45.3

gfs2-kmp-rt: before 5.3.18-45.3

dlm-kmp-rt-debuginfo: before 5.3.18-45.3

dlm-kmp-rt: before 5.3.18-45.3

cluster-md-kmp-rt-debuginfo: before 5.3.18-45.3

cluster-md-kmp-rt: before 5.3.18-45.3

kernel-source-rt: before 5.3.18-45.3

kernel-devel-rt: before 5.3.18-45.3

CPE2.3 External links

http://www.suse.com/support/update/announcement/2021/suse-su-20212599-1/


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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