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RHEL 5 : kernel (RHSA-2016:0450)

high Nessus Plugin ID 89956

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Synopsis

The remote Red Hat host is missing one or more security updates.

Description

Updated kernel packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

* An integer overflow flaw was found in the way the Linux kernel's Frame Buffer device implementation mapped kernel memory to user space via the mmap syscall. A local user able to access a frame buffer device file (/dev/fb*) could possibly use this flaw to escalate their privileges on the system. (CVE-2013-2596, Important)

* It was found that the Xen hypervisor x86 CPU emulator implementation did not correctly handle certain instructions with segment overrides, potentially resulting in a memory corruption. A malicious guest user could use this flaw to read arbitrary data relating to other guests, cause a denial of service on the host, or potentially escalate their privileges on the host. (CVE-2015-2151, Important)

This update also fixes the following bugs :

* Previously, the CPU power of a CPU group could be zero. As a consequence, a kernel panic occurred at 'find_busiest_group+570' with do_divide_error. The provided patch ensures that the division is only performed if the CPU power is not zero, and the aforementioned panic no longer occurs. (BZ#1209728)

* Prior to this update, a bug occurred when performing an online resize of an ext4 file system which had been previously converted from ext3. As a consequence, the kernel crashed. The provided patch fixes online resizing for such file systems by limiting the blockgroup search loop for non-extent files, and the mentioned kernel crash no longer occurs. (BZ#1301100)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2016:0450

https://access.redhat.com/security/cve/cve-2013-2596

https://access.redhat.com/security/cve/cve-2015-2151

Plugin Details

Severity: High

ID: 89956

File Name: redhat-RHSA-2016-0450.nasl

Version: 2.9

Type: local

Agent: unix

Published: 3/16/2016

Updated: 9/16/2022

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2015-2151

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:kernel-pae, p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-doc, p-cpe:/a:redhat:enterprise_linux:kernel-pae-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debug-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-devel, p-cpe:/a:redhat:enterprise_linux:kernel, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-xen-devel, cpe:/o:redhat:enterprise_linux:5, p-cpe:/a:redhat:enterprise_linux:kernel-headers, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debug, p-cpe:/a:redhat:enterprise_linux:kernel-pae-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-kdump, p-cpe:/a:redhat:enterprise_linux:kernel-xen-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-xen

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/15/2016

CISA Known Exploited Vulnerability Due Dates: 10/6/2022

Reference Information

CVE: CVE-2013-2596, CVE-2015-2151

RHSA: 2016:0450