SUSE update for the Linux Kernel (Live Patch 26 for SLE 15 SP1)

1) 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 (Live Patch 26 for SLE 15 SP1) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Live Patching: 15-SP1 - 15

SUSE Linux Enterprise Live Patching: 12-SP4 - 12-SP5

kgraft-patch-4_12_14-95_80-default: before 2-2.1

kgraft-patch-4_12_14-122_80-default: before 2-2.1

kernel-livepatch-4_12_14-150_75-default-debuginfo: before 2-2.1

kernel-livepatch-4_12_14-150_75-default: before 2-2.1

kernel-livepatch-4_12_14-197_99-default: before 2-2.1

kernel-livepatch-SLE15-SP2_Update_17-debugsource: before 2-2.1

kernel-livepatch-5_3_18-24_75-default-debuginfo: before 2-2.1

kernel-livepatch-5_3_18-24_75-default: before 2-2.1

CPE2.3

• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP2:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP4:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP5:*:*:*:*:*:*:*
• cpe:2.3:a:suse:kgraft-patch-4_12_14-95_80-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_12_14-122_80-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_75-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_75-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-197_99-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-sle15-sp2_update_17-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-5_3_18-24_75-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-5_3_18-24_75-default:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212695-1/

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.

2) 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 (Live Patch 26 for SLE 15 SP1) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Live Patching: 15-SP1 - 15

SUSE Linux Enterprise Live Patching: 12-SP4 - 12-SP5

kgraft-patch-4_12_14-95_80-default: before 2-2.1

kgraft-patch-4_12_14-122_80-default: before 2-2.1

kernel-livepatch-4_12_14-150_75-default-debuginfo: before 2-2.1

kernel-livepatch-4_12_14-150_75-default: before 2-2.1

kernel-livepatch-4_12_14-197_99-default: before 2-2.1

kernel-livepatch-SLE15-SP2_Update_17-debugsource: before 2-2.1

kernel-livepatch-5_3_18-24_75-default-debuginfo: before 2-2.1

kernel-livepatch-5_3_18-24_75-default: before 2-2.1

CPE2.3

• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP2:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP4:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP5:*:*:*:*:*:*:*
• cpe:2.3:a:suse:kgraft-patch-4_12_14-95_80-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_12_14-122_80-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_75-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_75-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-197_99-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-sle15-sp2_update_17-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-5_3_18-24_75-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-5_3_18-24_75-default:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20212695-1/

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.