CVE-2018-7755: Infoleak

Published Mar 8, 2018
·
Updated

An issue was discovered in the fdlockedioctl function in drivers/block/floppy.c in the Linux kernel through 4.15.7. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the location of kernel code and data and bypass kernel security protections such as KASLR.

Affected Software

40 affected componentsFixes available
Linux Linux kernel<=4.15.7
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=17.10
Canonical Ubuntu Linux=18.04
ubuntu/linux<3.13.0-153.203
3.13.0-153.203
ubuntu/linux-aws<4.4.0-1024.25
4.4.0-1024.25
ubuntu/linux-lts-xenial<4.4.0-130.156~14.04.1
4.4.0-130.156~14.04.1
ubuntu/linux<4.4.0-130.156
4.4.0-130.156
ubuntu/linux-aws<4.4.0-1062.71
4.4.0-1062.71
ubuntu/linux-azure<4.15.0-1014.14~16.04.1
4.15.0-1014.14~16.04.1
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<4.4.0-1029.34
4.4.0-1029.34
ubuntu/linux-oem<4.13.0-1031.35
4.13.0-1031.35
ubuntu/linux-raspi2<4.4.0-1092.100
4.4.0-1092.100
ubuntu/linux-snapdragon<4.4.0-1095.100
4.4.0-1095.100
ubuntu/linux-fips<4.4.0-1008.10
4.4.0-1008.10
ubuntu/linux<4.15.0-24.26
4.15.0-24.26
ubuntu/linux-aws<4.15.0-1011.11
4.15.0-1011.11
ubuntu/linux-azure<4.15.0-1014.14
4.15.0-1014.14
ubuntu/linux-gcp<4.15.0-1010.10
4.15.0-1010.10
ubuntu/linux-kvm<4.15.0-1012.12
4.15.0-1012.12
ubuntu/linux-oem<4.15.0-1009.12
4.15.0-1009.12
ubuntu/linux-raspi2<4.15.0-1013.14
4.15.0-1013.14
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 3.13.0-153.203
  2. Upgrade

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

    Fixed in 4.4.0-1024.25
  3. Upgrade

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

    Fixed in 4.4.0-130.156~14.04.1
  4. Upgrade

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

    Fixed in 4.4.0-130.156
  5. Upgrade

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

    Fixed in 4.4.0-1062.71
  6. Upgrade

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

    Fixed in 4.15.0-1014.14~16.04.1
  7. Upgrade

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

    Fixed in 4.15.0-1014.14~16.04.1
  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 4.4.0-1029.34
  10. Upgrade

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

    Fixed in 4.13.0-1031.35
  11. Upgrade

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

    Fixed in 4.4.0-1092.100
  12. Upgrade

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

    Fixed in 4.4.0-1095.100
  13. Upgrade

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

    Fixed in 4.4.0-1008.10
  14. Upgrade

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

    Fixed in 4.15.0-24.26
  15. Upgrade

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

    Fixed in 4.15.0-1011.11
  16. Upgrade

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

    Fixed in 4.15.0-1014.14
  17. Upgrade

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

    Fixed in 4.15.0-1010.10
  18. Upgrade

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

    Fixed in 4.15.0-1012.12
  19. Upgrade

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

    Fixed in 4.15.0-1009.12
  20. Upgrade

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

    Fixed in 4.15.0-1013.14
  21. 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

Event History

Mar 8, 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·07:00 AM
Data Sourced
via MITRE·07:00 AM
Description
Data Sourced
via NVD·07:29 AM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via Red Hat·02:18 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is CVE-2018-7755?

CVE-2018-7755 is a vulnerability that affects the Linux kernel through version 4.15.7.

2

How does CVE-2018-7755 affect the Linux kernel?

CVE-2018-7755 allows an attacker to copy a kernel pointer to user memory through the floppy driver's FDGETPRM ioctl.

3

What is the severity of CVE-2018-7755?

The severity of CVE-2018-7755 is low.

4

How can I fix CVE-2018-7755?

To fix CVE-2018-7755, update the Linux kernel to version 4.15.8 or later.

5

Where can I find more information about CVE-2018-7755?

You can find more information about CVE-2018-7755 on the following websites: [https://lkml.org/lkml/2018/3/7/1116](https://lkml.org/lkml/2018/3/7/1116), [https://marc.info/?l=linux-kernel&m=152046737321740&w=2](https://marc.info/?l=linux-kernel&m=152046737321740&w=2), [https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1553217](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1553217).

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203