CVE-2017-7518 - Improper Handling of Exceptional Conditions

Severity

46%

Complexity

39%

Confidentiality

106%

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 4.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P).

Overview

Type

Linux

First reported 6 years ago

2018-07-30 15:29:00

Last updated 5 years ago

2019-10-09 23:29:00

Affected Software

Red Hat Enterprise Linux (RHEL) 7.0 (7)

7.0

RedHat Enterprise Linux Desktop 7.0

7.0

RedHat Enterprise Linux Server 7.0

7.0

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 7.4

7.4

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.4

7.4

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.5

7.5

RedHat Enterprise Linux Workstation 7.0

7.0

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Debian Linux 8.0 (Jessie)

8.0

Debian Linux 9.0

9.0

Linux Kernel

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