Public Date:
1473209: CVE-2017-11473 kernel: Buffer overflow in mp_override_legacy_irq()
Buffer overflow in the mp_override_legacy_irq() function in arch/x86/kernel/acpi/boot.c in the Linux kernel through 4.12.2 allows local users to gain privileges via a crafted ACPI table.

Find out more about CVE-2017-11473 from the MITRE CVE dictionary dictionary and NIST NVD.


Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates of the Red Hat products. For additional information, refer to the Issue Severity Classification:

This attack requires

  • An attacker to be able to write to the ACPI tables ( local, privileged operation and non generalized attacks)
  • The ability for the attacker to reboot the system ( local, privileged operation )
  • The ACPI table changes to persist through reboots ( not common on cloud/serverless platforms )
  • This modification to the table alone is able to possibly corrupt memory, but the corruption will not be enough alone, the corrupted affected memory will be overwritten with valid acpi struct data which also has to corrupt the memory in which a way the flaw can create abuse (HARD).
  • The attacker will find it significantly difficult to abuse this a flaw in early-boot as injecting code/controlled execution at this point would require privileges. If an attacker had this specific privilege, there are easier ways to gain privilege escalation.

CVSS v3 metrics

CVSS3 Base Score 6.4
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact High
Availability Impact High

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (kernel-alt) RHSA-2018:0654 2018-04-10

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 realtime-kernel Will not fix
Red Hat Enterprise Linux 7 kernel-rt Will not fix
Red Hat Enterprise Linux 7 kernel Will not fix
Red Hat Enterprise Linux 6 kernel Will not fix
Red Hat Enterprise Linux 5 kernel Will not fix
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.
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