CVE-2018-7755

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-03-08 · updated 2026-06-17
Weakness: CWE-200

Description

An issue was discovered in the fd_locked_ioctl 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 products

Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 17.10, 18.04
Linux kernel: through 4.15.7

References

https://access.redhat.com/errata/RHSA-2019:2029
https://access.redhat.com/errata/RHSA-2019:2043
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://lkml.org/lkml/2018/3/7/1116
https://usn.ubuntu.com/3695-1/
https://usn.ubuntu.com/3695-2/
https://usn.ubuntu.com/3696-1/
https://usn.ubuntu.com/3696-2/
https://usn.ubuntu.com/3697-1/
https://usn.ubuntu.com/3697-2/
https://usn.ubuntu.com/3698-1/
https://usn.ubuntu.com/3698-2/

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