CVE-2016-4557

2016-05-0500:00:00

ubuntu.com

7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

0.001 Low

EPSS

Percentile

37.9%

JSON

The replace_map_fd_with_map_ptr function in kernel/bpf/verifier.c in the
Linux kernel before 4.5.5 does not properly maintain an fd data structure,
which allows local users to gain privileges or cause a denial of service
(use-after-free) via crafted BPF instructions that reference an incorrect
file descriptor.

Bugs

<https://launchpad.net/bugs/1578705>

Notes

Author	Note
jdstrand	android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support
sbeattie	affects 4.4 kernels only introduced in 0246e64d9a5f, but made exploitable by 1be7f75d1668

OSVersionArchitecturePackageVersionFilename
ubuntu16.04noarchlinux< 4.4.0-22.39UNKNOWN
ubuntu14.04noarchlinux-lts-xenial< 4.4.0-22.39~14.04.1UNKNOWN
ubuntu16.04noarchlinux-raspi2< 4.4.0-1010.12UNKNOWN
ubuntu16.04noarchlinux-snapdragon< 4.4.0-1013.14UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	16.04	noarch	linux	< 4.4.0-22.39	UNKNOWN
ubuntu	14.04	noarch	linux-lts-xenial	< 4.4.0-22.39~14.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-raspi2	< 4.4.0-1010.12	UNKNOWN
ubuntu	16.04	noarch	linux-snapdragon	< 4.4.0-1013.14	UNKNOWN