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USN-3070-1: Linux kernel vulnerabilities

29 August 2016

Several security issues were fixed in the kernel.

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Packages

Details

A missing permission check when settings ACLs was discovered in nfsd. A
local user could exploit this flaw to gain access to any file by setting an
ACL. (CVE-2016-1237)

Kangjie Lu discovered an information leak in the Reliable Datagram Sockets
(RDS) implementation in the Linux kernel. A local attacker could use this
to obtain potentially sensitive information from kernel memory.
(CVE-2016-5244)

James Patrick-Evans discovered that the airspy USB device driver in the
Linux kernel did not properly handle certain error conditions. An attacker
with physical access could use this to cause a denial of service (memory
consumption). (CVE-2016-5400)

Yue Cao et al discovered a flaw in the TCP implementation's handling of
challenge acks in the Linux kernel. A remote attacker could use this to
cause a denial of service (reset connection) or inject content into an TCP
stream. (CVE-2016-5696)

Pengfei Wang discovered a race condition in the MIC VOP driver in the Linux
kernel. A local attacker could use this to cause a denial of service
(system crash) or obtain potentially sensitive information from kernel
memory. (CVE-2016-5728)

Cyril Bur discovered that on PowerPC platforms, the Linux kernel mishandled
transactional memory state on exec(). A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2016-5828)

It was discovered that a heap based buffer overflow existed in the USB HID
driver in the Linux kernel. A local attacker could use this cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2016-5829)

It was discovered that the OverlayFS implementation in the Linux kernel did
not properly verify dentry state before proceeding with unlink and rename
operations. A local attacker could use this to cause a denial of service
(system crash). (CVE-2016-6197)

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Update instructions

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

Ubuntu 16.04

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

Related notices

  • USN-3070-2: linux-image-4.4.0-1021-raspi2, linux-raspi2
  • USN-3053-1: linux-image-3.19.0-66-powerpc64-emb, linux-image-extra-3.19.0-66-generic, linux-image-3.19.0-66-powerpc-e500mc, linux-image-3.19.0-66-generic-lpae, linux-image-3.19.0-66-generic, linux-lts-vivid, linux-image-3.19.0-66-powerpc64-smp, linux-image-3.19.0-66-powerpc-smp, linux-image-3.19.0-66-lowlatency
  • USN-3070-3: linux-snapdragon, linux-image-4.4.0-1024-snapdragon
  • USN-3070-4: linux-image-4.4.0-36-powerpc-smp, linux-image-4.4.0-36-powerpc64-smp, linux-image-4.4.0-36-generic-lpae, linux-image-extra-4.4.0-36-generic, linux-image-4.4.0-36-lowlatency, linux-image-4.4.0-36-powerpc64-emb, linux-lts-xenial, linux-image-4.4.0-36-generic, linux-image-4.4.0-36-powerpc-e500mc
  • USN-3072-2: linux-image-3.2.0-1487-omap4, linux-ti-omap4
  • USN-3072-1: linux-image-3.2.0-109-generic, linux, linux-image-3.2.0-109-omap, linux-image-3.2.0-109-powerpc-smp, linux-image-3.2.0-109-generic-pae, linux-image-3.2.0-109-powerpc64-smp, linux-image-3.2.0-109-highbank, linux-image-3.2.0-109-virtual
  • USN-3071-1: linux-image-3.13.0-95-lowlatency, linux-image-3.13.0-95-powerpc64-smp, linux-image-3.13.0-95-generic-lpae, linux-image-3.13.0-95-powerpc-e500mc, linux, linux-image-3.13.0-95-powerpc-smp, linux-image-extra-3.13.0-95-generic, linux-image-3.13.0-95-generic, linux-image-3.13.0-95-powerpc-e500, linux-image-3.13.0-95-powerpc64-emb
  • USN-3071-2: linux-image-3.13.0-95-generic, linux-lts-trusty, linux-image-3.13.0-95-generic-lpae

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Further reading