Red Hat Enterprise Linux 8 update for kpatch-patch

1) Use-after-free

EUVDB-ID: #VU28167

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-2020-12657

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in "block/bfq-iosched.c" file related to "bfq_idle_slice_timer_body". A local user can execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server - TUS: 8.2

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for x86_64: 8.0

kpatch-patch-4_18_0-193_1_2 (Red Hat package): before 1-1.el8_2

kpatch-patch-4_18_0-193 (Red Hat package): before 1-3.el8

CPE2.3

• cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_tus:8.2:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_little_endian:8:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:o:red_hat:red_hat_enterprise_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:kpatch-patch-4_18_0-193_1_2_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:kpatch-patch-4_18_0-193_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*

External links

https://access.redhat.com/errata/RHSA-2020:2567

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.