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ubuntucveUbuntu.comUB:CVE-2018-7755
HistoryMar 08, 2018 - 12:00 a.m.

CVE-2018-7755

2018-03-0800:00:00
ubuntu.com
ubuntu.com
10

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

30.7%

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.

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.
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux-aws< 4.15.0-1011.11UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1024.25UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1062.71UNKNOWN
ubuntu18.04noarchlinux-azure< 4.15.0-1014.14UNKNOWN
ubuntu16.04noarchlinux-azure< 4.15.0-1014.14~16.04.1UNKNOWN
ubuntu16.04noarchlinux-azure-edge< 4.15.0-1014.14UNKNOWN
ubuntu18.04noarchlinux-gcp< 4.15.0-1010.10UNKNOWN
ubuntu16.04noarchlinux-gcp< 4.15.0-1014.14~16.04.1UNKNOWN
ubuntu16.04noarchlinux-hwe< 4.15.0-24.26~16.04.1UNKNOWN
ubuntu16.04noarchlinux-hwe-edge< 4.15.0-24.26~16.04.1UNKNOWN
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5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

30.7%