SUSE update for the Linux Kernel (Live Patch 22 for SLE 12 SP5)

Published: 2021-10-12

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-3573 CVE-2021-3640
CWE-ID	CWE-416
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	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_14-122_83-default Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_18-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_78-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_78-default Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP3_Update_5-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-59_19-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-59_19-default Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU63662

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3573

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free in hci_sock_bound_ioctl() function of the Linux kernel HCI subsystem triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user can use this flaw to crash the system or escalate privileges on the system.

Mitigation

Update the affected package the Linux Kernel (Live Patch 22 for SLE 12 SP5) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Live Patching: 15-SP2 - 15-SP3

SUSE Linux Enterprise Live Patching: 12-SP5

kgraft-patch-4_12_14-122_83-default: before 3-2.1

kernel-livepatch-SLE15-SP2_Update_18-debugsource: before 3-2.1

kernel-livepatch-5_3_18-24_78-default-debuginfo: before 3-2.1

kernel-livepatch-5_3_18-24_78-default: before 3-2.1

kernel-livepatch-SLE15-SP3_Update_5-debugsource: before 3-2.1

kernel-livepatch-5_3_18-59_19-default-debuginfo: before 3-2.1

kernel-livepatch-5_3_18-59_19-default: before 3-2.1

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213361-1/

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-after-free

EUVDB-ID: #VU63769