USN-2468-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2468-1

13th January, 2015

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 14.10

Summary

Several security issues were fixed in the kernel.

Software description

• linux - Linux kernel

Details

A null pointer dereference flaw was discovered in the the Linux kernel's

SCTP implementation when ASCONF is used. A remote attacker could exploit

this flaw to cause a denial of service (system crash) via a malformed INIT

chunk. (CVE-2014-7841)

A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual

Machine) subsystem of the Linux kernel was discovered. A guest OS user

could exploit this flaw to cause a denial of service (guest OS crash) via a

specially crafted application. (CVE-2014-7842)

Miloš Prchlík reported a flaw in how the ARM64 platform handles a single

byte overflow in __clear_user. A local user could exploit this flaw to

cause a denial of service (system crash) by reading one byte beyond a

/dev/zero page boundary. (CVE-2014-7843)

A stack buffer overflow was discovered in the ioctl command handling for

the Technotrend/Hauppauge USB DEC devices driver. A local user could

exploit this flaw to cause a denial of service (system crash) or possibly

gain privileges. (CVE-2014-8884)

Update instructions

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

Ubuntu 14.10:

linux-image-3.16.0-29-powerpc-smp 3.16.0-29.39

linux-image-3.16.0-29-lowlatency 3.16.0-29.39

linux-image-3.16.0-29-powerpc-e500mc 3.16.0-29.39

linux-image-3.16.0-29-generic-lpae 3.16.0-29.39

linux-image-3.16.0-29-powerpc64-emb 3.16.0-29.39

linux-image-3.16.0-29-powerpc64-smp 3.16.0-29.39

linux-image-3.16.0-29-generic 3.16.0-29.39

To update your system, please follow these instructions: http://bit.ly/1aJDvTw.

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 automatically

perform this as well.

References

CVE-2014-7841, CVE-2014-7842, CVE-2014-7843, CVE-2014-8884

from Ubuntu Security Notices http://bit.ly/1DTS0mW