CVE-2015-7550

2015-12-3000:00:00

ubuntu.com

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.0004 Low

EPSS

Percentile

9.3%

JSON

The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel
before 4.3.4 does not properly use a semaphore, which allows local users to
cause a denial of service (NULL pointer dereference and system crash) or
possibly have unspecified other impact via a crafted application that
leverages a race condition between keyctl_revoke and keyctl_read calls.

Bugs

<https://launchpad.net/bugs/1530400>

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

OSVersionArchitecturePackageVersionFilename
ubuntu12.04noarchlinux< 3.2.0-99.139UNKNOWN
ubuntu14.04noarchlinux< 3.13.0-79.123UNKNOWN
ubuntu15.04noarchlinux< 3.19.0-51.57UNKNOWN
ubuntu15.10noarchlinux< 4.2.0-27.32UNKNOWN
ubuntu12.04noarchlinux-armadaxp< 3.2.0-1662.86UNKNOWN
ubuntu12.04noarchlinux-lts-trusty< 3.13.0-79.123~precise1UNKNOWN
ubuntu14.04noarchlinux-lts-utopic< 3.16.0-60.80~14.04.1UNKNOWN
ubuntu14.04noarchlinux-lts-vivid< 3.19.0-51.57~14.04.1UNKNOWN
ubuntu14.04noarchlinux-lts-wily< 4.2.0-27.32~14.04.1UNKNOWN
ubuntu15.10noarchlinux-raspi2< 4.2.0-1022.29UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	12.04	noarch	linux	< 3.2.0-99.139	UNKNOWN
ubuntu	14.04	noarch	linux	< 3.13.0-79.123	UNKNOWN
ubuntu	15.04	noarch	linux	< 3.19.0-51.57	UNKNOWN
ubuntu	15.10	noarch	linux	< 4.2.0-27.32	UNKNOWN
ubuntu	12.04	noarch	linux-armadaxp	< 3.2.0-1662.86	UNKNOWN
ubuntu	12.04	noarch	linux-lts-trusty	< 3.13.0-79.123~precise1	UNKNOWN
ubuntu	14.04	noarch	linux-lts-utopic	< 3.16.0-60.80~14.04.1	UNKNOWN
ubuntu	14.04	noarch	linux-lts-vivid	< 3.19.0-51.57~14.04.1	UNKNOWN
ubuntu	14.04	noarch	linux-lts-wily	< 4.2.0-27.32~14.04.1	UNKNOWN
ubuntu	15.10	noarch	linux-raspi2	< 4.2.0-1022.29	UNKNOWN