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
| Author | Note |
|---|---|
| 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
Status
| Package | Release | Status |
|---|---|---|
|
linux-flo Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Does not exist
|
|
| artful |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| xenial |
Ignored
(abandoned)
|
|
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Does not exist
|
|
| 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 |
upstream |
Needed
|
| bionic |
Does not exist
|
|
| 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 |
upstream |
Needed
|
| bionic |
Does not exist
|
|
| artful |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [end of standard support])
|
|
| xenial |
Does not exist
|
|
|
linux-aws Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Released
(4.15.0-1011.11)
|
|
| 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-hwe Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Not vulnerable
|
|
| 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 |
upstream |
Needed
|
| bionic |
Not vulnerable
(4.18.0-8.9~18.04.1)
|
|
| artful |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| xenial |
Released
(4.15.0-24.26~16.04.1)
|
|
|
linux-gke Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Does not exist
|
|
| artful |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| xenial |
Ignored
(end of standard support, was needs-triage)
|
|
|
linux-azure Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Released
(4.15.0-1014.14)
|
|
| 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-gcp Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Released
(4.15.0-1010.10)
|
|
| 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-kvm Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Released
(4.15.0-1012.12)
|
|
| artful |
Does not exist
|
|
| cosmic |
Not vulnerable
(4.15.0-1012.12)
|
|
| trusty |
Does not exist
|
|
| xenial |
Released
(4.4.0-1029.34)
|
|
|
linux-euclid Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Does not exist
|
|
| artful |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| xenial |
Ignored
(was needs-triage ESM criteria)
|
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
upstream |
Needed
|
| bionic |
Not vulnerable
(4.18.0-1003.3~18.04.1)
|
|
| cosmic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| xenial |
Released
(4.15.0-1014.14)
|
|
|
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 |
||
|
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 |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7755
- https://lkml.org/lkml/2018/3/7/1116
- https://ubuntu.com/security/notices/USN-3695-1
- https://ubuntu.com/security/notices/USN-3695-2
- https://ubuntu.com/security/notices/USN-3696-1
- https://ubuntu.com/security/notices/USN-3696-2
- https://ubuntu.com/security/notices/USN-3697-1
- https://ubuntu.com/security/notices/USN-3697-2
- https://ubuntu.com/security/notices/USN-3698-1
- https://ubuntu.com/security/notices/USN-3698-2
- NVD
- Launchpad
- Debian