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[Bug 1530400] Re: CVE-2015-7550

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Steve Beattie <sbeattie@xxxxxxxxxx>
Date: Wed, 10 Feb 2016 20:49:40 -0000
Reply-to: Bug 1530400 <1530400@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: linux-raspi2 (Ubuntu Xenial)
       Status: New => Fix Committed

** Description changed:

- [Linux keyring subsystem race leads to null dereference]
+ The keyctl_read_key function in security/keys/keyctl.c in the Linux
+ kernel before 4.3.4 does not properly use a semaphore, which allows
+ local users to cause a denial of service (NULL pointer dereference and
+ system crash) or possibly have unspecified other impact via a crafted
+ application that leverages a race condition between keyctl_revoke and
+ keyctl_read calls.
  
  Break-Fix: - b4a1b4f5047e4f54e194681125c74c0aa64d637d

-- 
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https://bugs.launchpad.net/bugs/1530400

Title:
  CVE-2015-7550

Status in linux package in Ubuntu:
  Fix Committed
Status in linux-armadaxp package in Ubuntu:
  Invalid
Status in linux-ec2 package in Ubuntu:
  New
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-lts-vivid package in Ubuntu:
  Invalid
Status in linux-lts-wily 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:
  New
Status in linux-raspi2 package in Ubuntu:
  Fix Committed
Status in linux-ti-omap4 package in Ubuntu:
  Invalid
Status in linux source package in Precise:
  Fix Committed
Status in linux-armadaxp source package in Precise:
  New
Status in linux-ec2 source package in Precise:
  New
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:
  Invalid
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 Committed
Status in linux-lts-utopic source package in Precise:
  Invalid
Status in linux-lts-vivid source package in Precise:
  Invalid
Status in linux-lts-wily 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:
  New
Status in linux-raspi2 source package in Precise:
  Invalid
Status in linux-ti-omap4 source package in Precise:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux-armadaxp source package in Trusty:
  Invalid
Status in linux-ec2 source package in Trusty:
  New
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-lts-vivid source package in Trusty:
  Fix Committed
Status in linux-lts-wily 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:
  New
Status in linux-raspi2 source package in Trusty:
  Invalid
Status in linux-ti-omap4 source package in Trusty:
  Invalid
Status in linux source package in Vivid:
  Fix Committed
Status in linux-armadaxp source package in Vivid:
  Invalid
Status in linux-ec2 source package in Vivid:
  New
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-lts-vivid source package in Vivid:
  Invalid
Status in linux-lts-wily 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:
  New
Status in linux-raspi2 source package in Vivid:
  Invalid
Status in linux-ti-omap4 source package in Vivid:
  Invalid
Status in linux source package in Wily:
  Fix Released
Status in linux-armadaxp source package in Wily:
  Invalid
Status in linux-ec2 source package in Wily:
  New
Status in linux-flo source package in Wily:
  New
Status in linux-fsl-imx51 source package in Wily:
  Invalid
Status in linux-goldfish source package in Wily:
  New
Status in linux-lts-backport-maverick source package in Wily:
  New
Status in linux-lts-backport-natty source package in Wily:
  New
Status in linux-lts-quantal source package in Wily:
  Invalid
Status in linux-lts-raring source package in Wily:
  Invalid
Status in linux-lts-saucy source package in Wily:
  Invalid
Status in linux-lts-trusty source package in Wily:
  Invalid
Status in linux-lts-utopic source package in Wily:
  Invalid
Status in linux-lts-vivid source package in Wily:
  Invalid
Status in linux-lts-wily source package in Wily:
  Invalid
Status in linux-mako source package in Wily:
  New
Status in linux-manta source package in Wily:
  New
Status in linux-mvl-dove source package in Wily:
  New
Status in linux-raspi2 source package in Wily:
  Fix Released
Status in linux-ti-omap4 source package in Wily:
  Invalid
Status in linux source package in Xenial:
  Fix Committed
Status in linux-armadaxp source package in Xenial:
  Invalid
Status in linux-ec2 source package in Xenial:
  New
Status in linux-flo source package in Xenial:
  New
Status in linux-fsl-imx51 source package in Xenial:
  Invalid
Status in linux-goldfish source package in Xenial:
  New
Status in linux-lts-backport-maverick source package in Xenial:
  New
Status in linux-lts-backport-natty source package in Xenial:
  New
Status in linux-lts-quantal source package in Xenial:
  Invalid
Status in linux-lts-raring source package in Xenial:
  Invalid
Status in linux-lts-saucy source package in Xenial:
  Invalid
Status in linux-lts-trusty source package in Xenial:
  Invalid
Status in linux-lts-utopic source package in Xenial:
  Invalid
Status in linux-lts-vivid source package in Xenial:
  Invalid
Status in linux-lts-wily source package in Xenial:
  Invalid
Status in linux-mako source package in Xenial:
  New
Status in linux-manta source package in Xenial:
  New
Status in linux-mvl-dove source package in Xenial:
  New
Status in linux-raspi2 source package in Xenial:
  Fix Committed
Status in linux-ti-omap4 source package in Xenial:
  Invalid

Bug description:
  The keyctl_read_key function in security/keys/keyctl.c in the Linux
  kernel before 4.3.4 does not properly use a semaphore, which allows
  local users to cause a denial of service (NULL pointer dereference and
  system crash) or possibly have unspecified other impact via a crafted
  application that leverages a race condition between keyctl_revoke and
  keyctl_read calls.

  Break-Fix: - b4a1b4f5047e4f54e194681125c74c0aa64d637d

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References

[Bug 1530400] [NEW] CVE-2015-7550
From: Steve Beattie, 2016-01-01