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[Launchpad Bug Tracker <1527374@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-lts-wily - 4.2.0-22.27~14.04.1

---------------
linux-lts-wily (4.2.0-22.27~14.04.1) trusty; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1527538

  [ Jann Horn ]

  * ptrace: being capable wrt a process requires mapped uids/gids
    - LP: #1527374

linux (4.2.0-22.26) wily; urgency=low

  [ Upstream Kernel Changes ]

  * xen: Add RING_COPY_REQUEST()
    - CVE-2015-8550
  * xen-netback: don't use last request to determine minimum Tx credit
    - CVE-2015-8550
  * xen-netback: use RING_COPY_REQUEST() throughout
    - CVE-2015-8550
  * xen-blkback: only read request operation from shared ring once
    - CVE-2015-8550
  * xen-blkback: read from indirect descriptors only once
    - CVE-2015-8550
  * xen-scsiback: safely copy requests
    - CVE-2015-8550
  * xen/pciback: Save xen_pci_op commands before processing it
    - CVE-2015-8550
  * xen/pciback: Return error on XEN_PCI_OP_enable_msi when device has MSI
    or MSI-X enabled
    - CVE-2015-8551, CVE-2015-8552, CVE-2015-8553
  * xen/pciback: Return error on XEN_PCI_OP_enable_msix when device has MSI
    or MSI-X enabled
    - CVE-2015-8551, CVE-2015-8552, CVE-2015-8553
  * xen/pciback: Do not install an IRQ handler for MSI interrupts.
    - CVE-2015-8551, CVE-2015-8552, CVE-2015-8553
  * xen/pciback: For XEN_PCI_OP_disable_msi[|x] only disable if device has
    MSI(X) enabled.
    - CVE-2015-8551, CVE-2015-8552, CVE-2015-8553
  * xen/pciback: Don't allow MSI-X ops if PCI_COMMAND_MEMORY is not set.
    - CVE-2015-8551, CVE-2015-8552, CVE-2015-8553

 -- Luis Henriques <luis.henriques@xxxxxxxxxxxxx>  Fri, 18 Dec 2015
10:27:07 +0000

** Changed in: linux-lts-wily (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1527374

Title:
  privilege escalation on attach through ptrace

Status in linux package in Ubuntu:
  Incomplete
Status in linux-armadaxp package in Ubuntu:
  New
Status in linux-flo package in Ubuntu:
  New
Status in linux-goldfish package in Ubuntu:
  New
Status in linux-lts-quantal package in Ubuntu:
  New
Status in linux-lts-raring package in Ubuntu:
  New
Status in linux-lts-saucy package in Ubuntu:
  New
Status in linux-lts-trusty package in Ubuntu:
  New
Status in linux-lts-utopic package in Ubuntu:
  Fix Released
Status in linux-lts-vivid package in Ubuntu:
  Fix Released
Status in linux-lts-wily package in Ubuntu:
  Fix Released
Status in linux-mako package in Ubuntu:
  New
Status in linux-manta package in Ubuntu:
  New
Status in linux-raspi2 package in Ubuntu:
  Fix Released
Status in linux-ti-omap4 package in Ubuntu:
  New
Status in lxc package in Ubuntu:
  New
Status in lxd package in Ubuntu:
  New
Status in linux source package in Precise:
  Invalid
Status in linux-lts-trusty source package in Precise:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Incomplete

Bug description:
  A kernel bug in user namespaces allows root in a container to ptrace
  host-root-owned tasks during a window of opportunity during lxc-attach
  / 'lxc exec', before they drop privilege by doing setuid to the
  container root uid.

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