CVE-2018-7492: Null Pointer Dereference

Published Dec 19, 2017
·
Updated

A NULL pointer dereference was found in net/rds/rdma.c:rdsrdmamap() function in the Linux kernel allowing local attackers to cause a system panic and a denial-of-service.

References:

https://patchwork.kernel.org/patch/10096441/

https://xorl.wordpress.com/2017/12/18/linux-kernel-rdma-null-pointer-dereference/

http://seclists.org/oss-sec/2018/q1/191

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f3069c6d33f6ae63a1668737bc78aaaa51bff7ca

Other sources

A NULL pointer dereference was found in the net/rds/rdma.c rdsrdmamap() function in the Linux kernel before 4.14.7 allowing local attackers to cause a system panic and a denial-of-service, related to RDSGETMR and RDSGETMRFORDEST.

— Ubuntu

Affected Software

34 affected componentsFixes available
Linux Linux kernel<4.14.7
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=17.10
ubuntu/linux<3.13.0-151.201
3.13.0-151.201
ubuntu/linux-aws<4.4.0-1016.16
4.4.0-1016.16
ubuntu/linux-lts-xenial<4.4.0-119.143~14.04.1
4.4.0-119.143~14.04.1
ubuntu/linux<4.4.0-119.143
4.4.0-119.143
ubuntu/linux-aws<4.4.0-1054.63
4.4.0-1054.63
ubuntu/linux-azure<4.15.0-1013.13~16.04.2
4.15.0-1013.13~16.04.2
ubuntu/linux-gcp<4.13.0-1019.23
4.13.0-1019.23
ubuntu/linux-hwe<4.15.0-24.26~16.04.1
4.15.0-24.26~16.04.1
ubuntu/linux-kvm<4.4.0-1020.25
4.4.0-1020.25
ubuntu/linux-oem<4.13.0-1030.33
4.13.0-1030.33
ubuntu/linux-raspi2<4.4.0-1086.94
4.4.0-1086.94
ubuntu/linux-snapdragon<4.4.0-1088.93
4.4.0-1088.93
ubuntu/linux-fips<4.4.0-1008.10
4.4.0-1008.10
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
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 3.13.0-151.201
  2. Upgrade

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

    Fixed in 4.4.0-1016.16
  3. Upgrade

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

    Fixed in 4.4.0-119.143~14.04.1
  4. Upgrade

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

    Fixed in 4.4.0-119.143
  5. Upgrade

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

    Fixed in 4.4.0-1054.63
  6. Upgrade

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

    Fixed in 4.15.0-1013.13~16.04.2
  7. Upgrade

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

    Fixed in 4.13.0-1019.23
  8. Upgrade

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

    Fixed in 4.15.0-24.26~16.04.1
  9. Upgrade

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

    Fixed in 4.4.0-1020.25
  10. Upgrade

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

    Fixed in 4.13.0-1030.33
  11. Upgrade

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

    Fixed in 4.4.0-1086.94
  12. Upgrade

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

    Fixed in 4.4.0-1088.93
  13. Upgrade

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

    Fixed in 4.4.0-1008.10
  14. 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 7.3.4-1
  15. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.14.7

Event History

Dec 19, 2017
Data Sourced
via Red Hat·11:02 AM
DescriptionSeverityAffected Software
Feb 26, 2018
CVE Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·08:00 PM
Data Sourced
via MITRE·08:00 PM
Description
Data Sourced
via NVD·08:29 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-2018-7492?

CVE-2018-7492 has a high severity rating due to its potential to cause a denial-of-service through a system crash.

2

How do I fix CVE-2018-7492?

To fix CVE-2018-7492, update to a kernel version that is not affected, specifically versions later than 4.14.7.

3

Which systems are affected by CVE-2018-7492?

CVE-2018-7492 affects Linux kernel versions up to 4.14.7 and specific Debian and Ubuntu releases.

4

What kind of attack does CVE-2018-7492 enable?

CVE-2018-7492 allows local attackers to cause a system panic, resulting in a denial-of-service.

5

Is there a patch available for CVE-2018-7492?

Yes, patches are available for CVE-2018-7492 in the form of updated kernel releases for affected systems.

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