CVE-2018-7995: Race Condition

Published Mar 9, 2018
·
Updated

DISPUTED Race condition in the storeintwithrestart() function in arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel through 4.15.7 allows local users to cause a denial of service (panic) by leveraging root access to write to the checkinterval file in a /sys/devices/system/machinecheck/machinecheck<cpu number> directory. NOTE: a third party has indicated that this report is not security relevant.

Affected Software

31 affected componentsFixes available
Linux Linux kernel<=4.15.7
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Debian Debian Linux=7.0
ubuntu/linux-aws<4.4.0-1022.22
4.4.0-1022.22
ubuntu/linux-lts-xenial<4.4.0-127.153~14.04.1
4.4.0-127.153~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-127.153
4.4.0-127.153
ubuntu/linux-aws<4.4.0-1060.69
4.4.0-1060.69
ubuntu/linux-azure<4.15.0-1013.13~16.04.2
4.15.0-1013.13~16.04.2
ubuntu/linux-gcp<4.15.0-1014.14~16.04.1
4.15.0-1014.14~16.04.1
ubuntu/linux-hwe<4.15.0-24.26~16.04.1
4.15.0-24.26~16.04.1
ubuntu/linux-kvm<4.4.0-1026.31
4.4.0-1026.31
ubuntu/linux-raspi2<4.4.0-1090.98
4.4.0-1090.98
ubuntu/linux-snapdragon<4.4.0-1093.98
4.4.0-1093.98
ubuntu/linux-fips<4.4.0-1008.10
4.4.0-1008.10
ubuntu/linux-snapdragon<4.15.0-1053.57
4.15.0-1053.57
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15*
ubuntu/linux-gke*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-azure-6.11*
ubuntu/linux-gcp-6.11*
ubuntu/linux-hwe-6.11*
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-raspi-realtime*
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.3-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1022.22
  2. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-127.153~14.04.1
  3. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-127.153
  4. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1060.69
  5. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1013.13~16.04.2
  6. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1014.14~16.04.1
  7. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-24.26~16.04.1
  8. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1026.31
  9. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1090.98
  10. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1093.98
  11. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1008.10
  12. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1053.57
  13. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1

Event History

Mar 9, 2018
CVE Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·03:00 PM
Data Sourced
via MITRE·03:00 PM
Description
Disputed
03:29 PM
Data Sourced
via NVD·03:29 PM
RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2018-7995?

CVE-2018-7995 has been classified as a denial of service vulnerability due to a race condition in the Linux kernel.

2

How do I fix CVE-2018-7995?

To fix CVE-2018-7995, update your Linux kernel to a version later than 4.15.7, including patched versions such as 5.10.223-1 or 6.1.123-1.

3

Which versions of Linux are affected by CVE-2018-7995?

CVE-2018-7995 affects the Linux kernel up to version 4.15.7 and specific distributions including Ubuntu 14.04, Ubuntu 16.04, and Debian 7.0.

4

How can CVE-2018-7995 be exploited?

CVE-2018-7995 can be exploited by local users with root access who write to the check_interval file causing system panic.

5

Is there a known mitigation for CVE-2018-7995?

The primary mitigation for CVE-2018-7995 is to ensure that systems are updated with the latest kernel patches that address the race condition.

Company

Resources

Contact

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