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CVE-2018-7755

Published: 8 March 2018

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.

From the Ubuntu Security Team

It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory).

Notes

AuthorNote
sbeattie
drivers/block/floppy.c::fd_locked_ioctl()
apw
the above patch mirrors the modifications from the compat path
though leaving the name as per the user.  Not progressing upstream.

Priority

Low

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1011.11)
upstream Needed

artful Does not exist

cosmic Not vulnerable
(4.15.0-1011.11)
trusty
Released (4.4.0-1024.25)
xenial
Released (4.4.0-1062.71)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1014.14)
upstream Needed

artful Does not exist

cosmic Not vulnerable
(4.15.0-1014.14)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.15.0-1014.14~16.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1003.3~18.04.1)
upstream Needed

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-1014.14)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Ignored
(was needs-triage ESM criteria)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1010.10)
upstream Needed

artful Does not exist

cosmic Not vulnerable
(4.15.0-1010.10)
trusty Does not exist

xenial
Released (4.15.0-1014.14~16.04.1)
linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Ignored
(end of standard support, was needs-triage)
linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-24.26~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-8.9~18.04.1)
upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-24.26~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1012.12)
upstream Needed

artful Does not exist

cosmic Not vulnerable
(4.15.0-1012.12)
trusty Does not exist

xenial
Released (4.4.0-1029.34)
linux-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Ignored
(end of life, was needs-triage)
xenial Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream Needed

artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-46.51)
bionic
Released (4.15.0-24.26)
cosmic Not vulnerable
(4.15.0-29.31)
trusty
Released (3.13.0-153.203)
upstream Needed

xenial
Released (4.4.0-130.156)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by local-2018-7755-1|65eea8edc315589d6c993cf12dbb5d0e9ef1fe4e
linux-armadaxp
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-goldfish
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Needed

xenial Ignored
(end of life, was needs-triage)
linux-grouper
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Needed

xenial Does not exist

linux-linaro-omap
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

linux-lts-quantal
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

linux-lts-saucy
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty
Released (4.4.0-130.156~14.04.1)
upstream Needed

xenial Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Needed

xenial Does not exist

linux-mako
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Needed

xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Needed

xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1009.12)
cosmic Not vulnerable
(4.15.0-1009.12)
trusty Does not exist

upstream Needed

xenial
Released (4.13.0-1031.35)
linux-qcm-msm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-1023.24)
bionic
Released (4.15.0-1013.14)
cosmic Not vulnerable
(4.15.0-1021.23)
trusty Does not exist

upstream Needed

xenial
Released (4.4.0-1092.100)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful
Released (4.4.0-1095.100)
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial
Released (4.4.0-1095.100)
linux-ti-omap4
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream Needed

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N