SUSE update for the Linux Kernel (Live Patch 19 for SLE 15 SP1)
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2020-36385 CVE-2021-22555 CVE-2021-33909 |
| CWE-ID | CWE-416 CWE-787 CWE-190 |
| Exploitation vector | Local |
| Public exploit |
Vulnerability #2 is being exploited in the wild. Public exploit code for vulnerability #3 is available. |
| Vulnerable software |
SUSE Linux Enterprise Module for Live Patching Operating systems & Components / Operating system SUSE Linux Enterprise Live Patching Operating systems & Components / Operating system kgraft-patch-4_12_14-95_68-default Operating systems & Components / Operating system package or component kernel-livepatch-4_12_14-197_72-default Operating systems & Components / Operating system package or component |
| Vendor | SUSE |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Use-after-free
EUVDB-ID: #VU58332
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-2020-36385
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in drivers/infiniband/core/ucma.c, because the ctx is reached via the ctx_list in some ucma_migrate_id situations where ucma_close is called. A local user can run a specially crafted program to trigger the use-after-free error and execute arbitrary code with elevated privileges.
Update the affected package the Linux Kernel (Live Patch 19 for SLE 15 SP1) to the latest version.
Vulnerable software versionsSUSE Linux Enterprise Module for Live Patching: 15-SP1
SUSE Linux Enterprise Live Patching: 12-SP4
kgraft-patch-4_12_14-95_68-default: before 8-2.2
kernel-livepatch-4_12_14-197_72-default: before 9-2.2
CPE2.3- cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP1:*:*:*:*:*:*:*
- cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP4:*:*:*:*:*:*:*
- cpe:2.3:a:suse:kgraft-patch-4_12_14-95_68-default:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:a:suse:kernel-livepatch-4_12_14-197_72-default:*:*:*:*:*:suse_linux:*:*
https://www.suse.com/support/update/announcement/2021/suse-su-20212584-1/
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 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.
Update the affected package the Linux Kernel (Live Patch 19 for SLE 15 SP1) to the latest version.
Vulnerable software versionsSUSE Linux Enterprise Module for Live Patching: 15-SP1
SUSE Linux Enterprise Live Patching: 12-SP4
kgraft-patch-4_12_14-95_68-default: before 8-2.2
kernel-livepatch-4_12_14-197_72-default: before 9-2.2
CPE2.3- cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP1:*:*:*:*:*:*:*
- cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP4:*:*:*:*:*:*:*
- cpe:2.3:a:suse:kgraft-patch-4_12_14-95_68-default:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:a:suse:kernel-livepatch-4_12_14-197_72-default:*:*:*:*:*:suse_linux:*:*
https://www.suse.com/support/update/announcement/2021/suse-su-20212584-1/
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.
3) Integer overflow
EUVDB-ID: #VU55143
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-2021-33909
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to integer overflow during size_t-to-int conversion when creating, mounting, and deleting a deep directory structure whose total path length exceeds 1GB. An unprivileged local user can write up to 10-byte string to an offset of exactly -2GB-10B below the beginning of a vmalloc()ated kernel buffer.
Successful exploitation of vulnerability may allow an attacker to exploit the our-of-bounds write vulnerability to execute arbitrary code with root privileges.
Update the affected package the Linux Kernel (Live Patch 19 for SLE 15 SP1) to the latest version.
Vulnerable software versionsSUSE Linux Enterprise Module for Live Patching: 15-SP1
SUSE Linux Enterprise Live Patching: 12-SP4
kgraft-patch-4_12_14-95_68-default: before 8-2.2
kernel-livepatch-4_12_14-197_72-default: before 9-2.2
CPE2.3- cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP1:*:*:*:*:*:*:*
- cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP4:*:*:*:*:*:*:*
- cpe:2.3:a:suse:kgraft-patch-4_12_14-95_68-default:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:a:suse:kernel-livepatch-4_12_14-197_72-default:*:*:*:*:*:suse_linux:*:*
https://www.suse.com/support/update/announcement/2021/suse-su-20212584-1/
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.
