Improper privilege management in Linux kernel - CVE-2015-8539

Vulnerability identifier: #VU92476

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-8539

CWE-ID: CWE-269

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to improper privilege management error within the user_update() function in security/keys/user_defined.c, within the trusted_rcu_free() function in security/keys/trusted.c, within the encrypted_update() function in security/keys/encrypted-keys/encrypted.c. A local user can execute arbitrary code.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server (for IBM Power LE) - 4 Year Extended Update Support
Red Hat Enterprise Linux Server - 4 Year Extended Update Support
MRG Realtime
Red Hat Virtualization Host
kernel (Red Hat package)
kernel-rt (Red Hat package)

Install update from vendor's repository.

kernel (Red Hat package) - update to 3.10.0-693.17.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.17.1.rt56.604.el6rt, 3.10.0-693.17.1.rt56.636.el7

• http://www.openwall.com/lists/oss-security/2015/12/09/1
• https://github.com/torvalds/linux/commit/096fe9eaea40a17e125569f9e657e34cdb6d73bd
• https://bugzilla.redhat.com/show_bug.cgi?id=1284450
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
• http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00017.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00021.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00020.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00007.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00008.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00034.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00018.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00019.html
• https://access.redhat.com/errata/RHSA-2018:0181
• https://access.redhat.com/errata/RHSA-2018:0152
• https://access.redhat.com/errata/RHSA-2018:0151
• https://usn.ubuntu.com/3798-2/
• https://usn.ubuntu.com/3798-1/

• Improper privilege management in Linux kernel keys encrypted-keys
• Red Hat Enterprise MRG 2 update for kernel-rt
• Red Hat Enterprise Linux 7 update for kernel-rt
• Red Hat Enterprise Linux 7 update for kernel