Bug 1795624 (CVE-2020-7053) - CVE-2020-7053 kernel: use-after-free in i915_ppgtt_close in drivers/gpu/drm/i915/i915_gem_gtt.c
Summary: CVE-2020-7053 kernel: use-after-free in i915_ppgtt_close in drivers/gpu/drm/i...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-7053
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1795626 1814731 1814732 1814733 1814734 1814735
Blocks: 1795627
TreeView+ depends on / blocked
 
Reported: 2020-01-28 13:53 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-03-22 21:52 UTC (History)
46 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel’s GPU driver functionality when destroying GEM context. A local user could use this flaw to crash the system or potentially escalate their privileges.
Clone Of:
Environment:
Last Closed: 2021-03-16 19:18:52 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:0856 0 None None None 2021-03-16 13:50:44 UTC
Red Hat Product Errata RHSA-2021:0857 0 None None None 2021-03-16 13:51:48 UTC

Description Guilherme de Almeida Suckevicz 2020-01-28 13:53:28 UTC 
In the Linux kernel 4.14 longterm through 4.14.165 and 4.19 longterm through 4.19.96 (and 5.x before 5.2), there is a use-after-free (write) in the i915_ppgtt_close function in drivers/gpu/drm/i915/i915_gem_gtt.c. This is related to i915_gem_context_destroy_ioctl in drivers/gpu/drm/i915/i915_gem_context.c.

Reference:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1859522

Upstream commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7dc40713618c884bf07c030d1ab1f47a9dc1f310
Comment 1 Guilherme de Almeida Suckevicz 2020-01-28 13:54:31 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1795626]
Comment 2 Justin M. Forbes 2020-01-28 17:11:32 UTC 
This was fixed for Fedora with the 5.2.x kernel rebases.
Comment 9 Alex 2020-03-19 11:16:36 UTC 
Mitigation:

In case of dedicated graphic card presence and i915 GPU is not being used, you can prevent module i915 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
Comment 10 Alex 2020-03-19 11:27:56 UTC 
Statement:

The impact of this issue is Moderate, because attack is specific for certain Intel hardware and could be triggered only by local user with write access to the device.
Comment 14 errata-xmlrpc 2021-03-16 13:50:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0856 https://access.redhat.com/errata/RHSA-2021:0856
Comment 15 errata-xmlrpc 2021-03-16 13:51:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0857 https://access.redhat.com/errata/RHSA-2021:0857
Comment 16 Product Security DevOps Team 2021-03-16 19:18:52 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-7053
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