Red Hat update for kernel

1) Speculative Store Bypass

EUVDB-ID: #VU12911

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-2018-3639

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists due to race conditions in CPU cache processing. A local attacker can conduct a side-channel attack to exploit a flaw in the speculative execution of Load and Store instructions to read privileged memory.

Note: the vulnerability is referred to as "Spectre variant 4".

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 6.7

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 6.7

Red Hat Enterprise Linux Server - Extended Update Support: 6.7

kernel (Red Hat package): 2.6.32-71.7.1.el6 - 2.6.32-573.59.1.el6

Red Hat Enterprise Linux EUS Compute Node: 6.7

:

CPE2.3

• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_big_endian_-_extended_update_support:6.7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_ibm_z_systems_-_extended_update_support:6.7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red hat enterprise linux server - extended update support:6.7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel_redhat_package:2.6.32-504.80.2.el6:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel_redhat_package:2.6.32-504.79.3.el6:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel_redhat_package:2.6.32-431.95.3.el6:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_eus_compute_node:6.7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:::::*:*:*:*:*:*:

External links

http://access.redhat.com/errata/RHSA-2018:2250

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.