Red Hat update for kernel

1) Side-channel attack

EUVDB-ID: #VU13337

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-3665

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists due to utilizing the Lazy FP state restore technique for floating point state when context switching between application processes. A local attacker can conduct cache side-channel attacks and determine register values of other processes.

Note: This vulnerability is known as LazyFP.

Mitigation

Install update from vendor's website.

Vulnerable software versions

kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-862.3.2.rt56.808.el7

Red Hat Enterprise Linux for Real Time: 7

Red Hat Enterprise Linux for Real Time for NFV: 7

:

CPE2.3

• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.17.1.rt56.636.el7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.rt56.617.el7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-229.1.2.rt56.141.2.el7_1:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:::::*:*:*:*:*:*:

External links

http://access.redhat.com/errata/RHSA-2018:1944

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.