kernel-packages team mailing list archive

[John Johansen <john.johansen@xxxxxxxxxxxxx>]

** Description changed:

- Linux 2.6.32 - 3.18 that runs KVM may enable a malicious guest process
- to crash the guest OS or launch a privilege escalation attack on the
- guest. The attack can be launched by tricking the hypervisor to emulate
- a SYSENTER instruction in 16-bit mode, if the guest OS does not
- initialize the SYSENTER MSRs. KVM does not check under these conditions
- that the selector IA32_SYSENTER_CS is not zero, and does not generate a
- #GP exception as real hardware does. Instead, it sets the guest
- instruction pointer to zero and changes the code privilege level (CPL)
- to zero (privileged). Note that the attack can only be issued under very
- certain conditions (see the details below). Windows and distro Linux
- guest OSes should be safe. The bug existed since the introduction of
- SYSENTER emulation (em_sysenter function on recent Linux releases), in
- commit 8c60435261deaefeb53ce3222d04d7d5bea81296 , which is present in
- Linux 2.6.32 - 3.18.
+ The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel
+ before 3.18.5, when the guest OS lacks SYSENTER MSR initialization,
+ allows guest OS users to gain guest OS privileges or cause a denial of
+ service (guest OS crash) by triggering use of a 16-bit code segment for
+ emulation of a SYSENTER instruction.
  
  Break-Fix: - f3747379accba8e95d70cec0eae0582c8c182050

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https://bugs.launchpad.net/bugs/1414651

Title:
  CVE-2015-0239

Status in linux package in Ubuntu:
  Invalid
Status in linux-armadaxp package in Ubuntu:
  Invalid
Status in linux-ec2 package in Ubuntu:
  Invalid
Status in linux-flo package in Ubuntu:
  New
Status in linux-fsl-imx51 package in Ubuntu:
  Invalid
Status in linux-goldfish package in Ubuntu:
  New
Status in linux-lts-backport-maverick package in Ubuntu:
  New
Status in linux-lts-backport-natty package in Ubuntu:
  New
Status in linux-lts-quantal package in Ubuntu:
  Invalid
Status in linux-lts-raring package in Ubuntu:
  Invalid
Status in linux-lts-saucy package in Ubuntu:
  Invalid
Status in linux-lts-trusty package in Ubuntu:
  Invalid
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux-mako package in Ubuntu:
  New
Status in linux-manta package in Ubuntu:
  New
Status in linux-mvl-dove package in Ubuntu:
  Invalid
Status in linux-ti-omap4 package in Ubuntu:
  Invalid
Status in linux source package in Lucid:
  New
Status in linux-armadaxp source package in Lucid:
  Invalid
Status in linux-ec2 source package in Lucid:
  New
Status in linux-flo source package in Lucid:
  Invalid
Status in linux-fsl-imx51 source package in Lucid:
  Invalid
Status in linux-goldfish source package in Lucid:
  Invalid
Status in linux-lts-backport-maverick source package in Lucid:
  New
Status in linux-lts-backport-natty source package in Lucid:
  New
Status in linux-lts-quantal source package in Lucid:
  Invalid
Status in linux-lts-raring source package in Lucid:
  Invalid
Status in linux-lts-saucy source package in Lucid:
  Invalid
Status in linux-lts-trusty source package in Lucid:
  Invalid
Status in linux-lts-utopic source package in Lucid:
  Invalid
Status in linux-mako source package in Lucid:
  Invalid
Status in linux-manta source package in Lucid:
  Invalid
Status in linux-mvl-dove source package in Lucid:
  Invalid
Status in linux-ti-omap4 source package in Lucid:
  Invalid
Status in linux source package in Precise:
  Fix Released
Status in linux-armadaxp source package in Precise:
  Fix Released
Status in linux-ec2 source package in Precise:
  Invalid
Status in linux-flo source package in Precise:
  Invalid
Status in linux-fsl-imx51 source package in Precise:
  Invalid
Status in linux-goldfish source package in Precise:
  Invalid
Status in linux-lts-backport-maverick source package in Precise:
  New
Status in linux-lts-backport-natty source package in Precise:
  New
Status in linux-lts-quantal source package in Precise:
  Fix Committed
Status in linux-lts-raring source package in Precise:
  Invalid
Status in linux-lts-saucy source package in Precise:
  Invalid
Status in linux-lts-trusty source package in Precise:
  Fix Released
Status in linux-lts-utopic source package in Precise:
  Invalid
Status in linux-mako source package in Precise:
  Invalid
Status in linux-manta source package in Precise:
  Invalid
Status in linux-mvl-dove source package in Precise:
  Invalid
Status in linux-ti-omap4 source package in Precise:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux-armadaxp source package in Trusty:
  Invalid
Status in linux-ec2 source package in Trusty:
  Invalid
Status in linux-flo source package in Trusty:
  Invalid
Status in linux-fsl-imx51 source package in Trusty:
  Invalid
Status in linux-goldfish source package in Trusty:
  Invalid
Status in linux-lts-backport-maverick source package in Trusty:
  New
Status in linux-lts-backport-natty source package in Trusty:
  New
Status in linux-lts-quantal source package in Trusty:
  Invalid
Status in linux-lts-raring source package in Trusty:
  Invalid
Status in linux-lts-saucy source package in Trusty:
  Invalid
Status in linux-lts-trusty source package in Trusty:
  Invalid
Status in linux-lts-utopic source package in Trusty:
  Fix Released
Status in linux-mako source package in Trusty:
  Invalid
Status in linux-manta source package in Trusty:
  Invalid
Status in linux-mvl-dove source package in Trusty:
  Invalid
Status in linux-ti-omap4 source package in Trusty:
  Invalid
Status in linux source package in Utopic:
  Fix Released
Status in linux-armadaxp source package in Utopic:
  Invalid
Status in linux-ec2 source package in Utopic:
  Invalid
Status in linux-flo source package in Utopic:
  New
Status in linux-fsl-imx51 source package in Utopic:
  Invalid
Status in linux-goldfish source package in Utopic:
  New
Status in linux-lts-backport-maverick source package in Utopic:
  New
Status in linux-lts-backport-natty source package in Utopic:
  New
Status in linux-lts-quantal source package in Utopic:
  Invalid
Status in linux-lts-raring source package in Utopic:
  Invalid
Status in linux-lts-saucy source package in Utopic:
  Invalid
Status in linux-lts-trusty source package in Utopic:
  Invalid
Status in linux-lts-utopic source package in Utopic:
  Invalid
Status in linux-mako source package in Utopic:
  New
Status in linux-manta source package in Utopic:
  New
Status in linux-mvl-dove source package in Utopic:
  Invalid
Status in linux-ti-omap4 source package in Utopic:
  Invalid
Status in linux source package in Vivid:
  Invalid
Status in linux-armadaxp source package in Vivid:
  Invalid
Status in linux-ec2 source package in Vivid:
  Invalid
Status in linux-flo source package in Vivid:
  New
Status in linux-fsl-imx51 source package in Vivid:
  Invalid
Status in linux-goldfish source package in Vivid:
  New
Status in linux-lts-backport-maverick source package in Vivid:
  New
Status in linux-lts-backport-natty source package in Vivid:
  New
Status in linux-lts-quantal source package in Vivid:
  Invalid
Status in linux-lts-raring source package in Vivid:
  Invalid
Status in linux-lts-saucy source package in Vivid:
  Invalid
Status in linux-lts-trusty source package in Vivid:
  Invalid
Status in linux-lts-utopic source package in Vivid:
  Invalid
Status in linux-mako source package in Vivid:
  New
Status in linux-manta source package in Vivid:
  New
Status in linux-mvl-dove source package in Vivid:
  Invalid
Status in linux-ti-omap4 source package in Vivid:
  Invalid

Bug description:
  The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel
  before 3.18.5, when the guest OS lacks SYSENTER MSR initialization,
  allows guest OS users to gain guest OS privileges or cause a denial of
  service (guest OS crash) by triggering use of a 16-bit code segment
  for emulation of a SYSENTER instruction.

  Break-Fix: - f3747379accba8e95d70cec0eae0582c8c182050

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