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[USN-2418-1] Linux kernel (OMAP4) vulnerabilities

Posted on 25 November 2014
Ubuntu Security

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Ubuntu Security Notice USN-2418-1
November 25, 2014

linux-ti-omap4 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-ti-omap4: Linux kernel for OMAP4

Details:

Nadav Amit reported that the KVM (Kernel Virtual Machine) mishandles
noncanonical addresses when emulating instructions that change the rip
(Instruction Pointer). A guest user with access to I/O or the MMIO can us=
e
this flaw to cause a denial of service (system crash) of the guest.
(CVE-2014-3647)

A flaw was discovered with the handling of the invept instruction in the
KVM (Kernel Virtual Machine) subsystem of the Linux kernel. An unprivileg=
ed
guest user could exploit this flaw to cause a denial of service (system
crash) on the guest. (CVE-2014-3646)

A flaw was discovered with invept instruction support when using nested E=
PT
in the KVM (Kernel Virtual Machine). An unprivileged guest user could
exploit this flaw to cause a denial of service (system crash) on the gues=
t.
(CVE-2014-3645)

Lars Bull reported a race condition in the PIT (programmable interrupt
timer) emulation in the KVM (Kernel Virtual Machine) subsystem of the Lin=
ux
kernel. A local guest user with access to PIT i/o ports could exploit thi=
s
flaw to cause a denial of service (crash) on the host. (CVE-2014-3611)

Lars Bull and Nadav Amit reported a flaw in how KVM (the Kernel Virtual
Machine) handles noncanonical writes to certain MSR registers. A privileg=
ed
guest user can exploit this flaw to cause a denial of service (kernel
panic) on the host. (CVE-2014-3610)

A flaw in the handling of malformed ASCONF chunks by SCTP (Stream Control=

Transmission Protocol) implementation in the Linux kernel was discovered.=
A
remote attacker could exploit this flaw to cause a denial of service
(system crash). (CVE-2014-3673)

A flaw in the handling of duplicate ASCONF chunks by SCTP (Stream Control=

Transmission Protocol) implementation in the Linux kernel was discovered.=
A
remote attacker could exploit this flaw to cause a denial of service
(panic). (CVE-2014-3687)

It was discovered that excessive queuing by SCTP (Stream Control
Transmission Protocol) implementation in the Linux kernel can cause memor=
y
pressure. A remote attacker could exploit this flaw to cause a denial of
service. (CVE-2014-3688)

A flaw was discovered in how the Linux kernel's KVM (Kernel Virtual
Machine) subsystem handles the CR4 control register at VM entry on Intel
processors. A local host OS user can exploit this to cause a denial of
service (kill arbitrary processes, or system disruption) by leveraging
/dev/kvm access. (CVE-2014-3690)

Don Bailey discovered a flaw in the LZO decompress algorithm used by the
Linux kernel. An attacker could exploit this flaw to cause a denial of
service (memory corruption or OOPS). (CVE-2014-4608)

It was discovered the Linux kernel's implementation of IPv6 did not
properly validate arguments in the ipv6_select_ident function. A local us=
er
could exploit this flaw to cause a denial of service (system crash) by
leveraging tun or macvtap device access. (CVE-2014-7207)

Andy Lutomirski discovered that the Linux kernel was not checking the
CAP_SYS_ADMIN when remounting filesystems to read-only. A local user coul=
d
exploit this flaw to cause a denial of service (loss of writability).
(CVE-2014-7975)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 LTS:
linux-image-3.2.0-1456-omap4 3.2.0-1456.76

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic=
,
linux-server, linux-powerpc), a standard system upgrade will automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2418-1
CVE-2014-3610, CVE-2014-3611, CVE-2014-3645, CVE-2014-3646,
CVE-2014-3647, CVE-2014-3673, CVE-2014-3687, CVE-2014-3688,
CVE-2014-3690, CVE-2014-4608, CVE-2014-7207, CVE-2014-7975

Package Information:
https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1456.76

 

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