Scientific Linux Security Update : kernel on SL6.x i386/x86_64

This script is Copyright (C) 2012 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

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

This update fixes the following security issues :

- A local, unprivileged user could use an integer overflow
flaw in drm_mode_dirtyfb_ioctl() to cause a denial of
service or escalate their privileges. (CVE-2012-0044,
Important)

- A buffer overflow flaw was found in the macvtap device
driver, used for creating a bridged network between the
guest and the host in KVM (Kernel-based Virtual Machine)
environments. A privileged guest user in a KVM guest
could use this flaw to crash the host. Note: This issue
only affected hosts that have the vhost_net module
loaded with the experimental_zcopytx module option
enabled (it is not enabled by default), and that also
have macvtap configured for at least one guest.
(CVE-2012-2119, Important)

- When a set user ID (setuid) application is executed,
certain personality flags for controlling the
application's behavior are cleared (that is, a
privileged application will not be affected by those
flags). It was found that those flags were not cleared
if the application was made privileged via file system
capabilities. A local, unprivileged user could use this
flaw to change the behavior of such applications,
allowing them to bypass intended restrictions. Note that
for default installations, no application shipped by us
for Scientific Linux is made privileged via file system
capabilities. (CVE-2012-2123, Important)

- It was found that the data_len parameter of the
sock_alloc_send_pskb() function in the Linux kernel's
networking implementation was not validated before use.
A privileged guest user in a KVM guest could use this
flaw to crash the host or, possibly, escalate their
privileges on the host. (CVE-2012-2136, Important)

- A buffer overflow flaw was found in the
setup_routing_entry() function in the KVM subsystem of
the Linux kernel in the way the Message Signaled
Interrupts (MSI) routing entry was handled. A local,
unprivileged user could use this flaw to cause a denial
of service or, possibly, escalate their privileges.
(CVE-2012-2137, Important)

- A race condition was found in the Linux kernel's memory
management subsystem in the way pmd_none_or_clear_bad(),
when called with mmap_sem in read mode, and Transparent
Huge Pages (THP) page faults interacted. A privileged
user in a KVM guest with the ballooning functionality
enabled could potentially use this flaw to crash the
host. A local, unprivileged user could use this flaw to
crash the system. (CVE-2012-1179, Moderate)

- A flaw was found in the way device memory was handled
during guest device removal. Upon successful device
removal, memory used by the device was not properly
unmapped from the corresponding IOMMU or properly
released from the kernel, leading to a memory leak. A
malicious user on a KVM host who has the ability to
assign a device to a guest could use this flaw to crash
the host. (CVE-2012-2121, Moderate)

- A flaw was found in the Linux kernel's Reliable Datagram
Sockets (RDS) protocol implementation. A local,
unprivileged user could use this flaw to cause a denial
of service. (CVE-2012-2372, Moderate)

- A race condition was found in the Linux kernel's memory
management subsystem in the way pmd_populate() and
pte_offset_map_lock() interacted on 32-bit x86 systems
with more than 4GB of RAM. A local, unprivileged user
could use this flaw to cause a denial of service.
(CVE-2012-2373, Moderate)

This update also fixes several bugs.

Users should upgrade to these updated packages, which contain
backported patches to correct these issues. The system must be
rebooted for this update to take effect.

See also :

http://www.nessus.org/u?09fe3653

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 61331 ()

Bugtraq ID:

CVE ID: CVE-2012-0044
CVE-2012-1179
CVE-2012-2119
CVE-2012-2121
CVE-2012-2123
CVE-2012-2136
CVE-2012-2137
CVE-2012-2372
CVE-2012-2373