CVE intelligence and bounded remediation

CVE-2017-7518 — Redhat Enterprise Linux security vulnerability

High CVSS 7.8

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.

Severity
High
CVSS
7.8 (3.0)
Published
2018-07-30
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-250, CWE-755

Affected products

  • redhat / enterprise_linux / 7.0
  • redhat / enterprise_linux_desktop / 7.0
  • redhat / enterprise_linux_server / 7.0
  • redhat / enterprise_linux_server_aus / 7.4
  • redhat / enterprise_linux_server_eus / 7.4
  • redhat / enterprise_linux_server_eus / 7.5

Showing 6 representative product identities from 12 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Privilege escalation and unsafe privilege management

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map service accounts, operating-system identities, roles, capabilities, impersonation, set-user transitions, and administrative helper paths.
  • Determine whether untrusted users or lower-privilege processes can reach the affected transition or modify inputs it trusts.
  • Review file, socket, registry, device, job, container, and cloud-role permissions used before and after privilege changes.

Remediate safely

  • Apply the supported fix and redesign privileged operations as a minimal, authenticated, allowlisted interface.
  • Drop privileges before processing untrusted input, verify the drop succeeds, and remove unnecessary roles, capabilities, and write permissions.
  • Validate ownership and permissions at time of use and add explicit lower-to-higher privilege boundary tests.

Authoritative sources

Complete CVE record and remediation plan

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