Bug 1738708 (CVE-2018-20855) - CVE-2018-20855 kernel: Information leak in create_qp_common in drivers/infiniband/hw/mlx5/qp.c
Summary: CVE-2018-20855 kernel: Information leak in create_qp_common in drivers/infini...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-20855
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: 1738709 1773437 1773438 1773439
Blocks: 1738710
TreeView+ depends on / blocked
 
Reported: 2019-08-07 22:23 UTC by Pedro Sampaio
Modified: 2023-10-06 18:28 UTC (History)
40 users (show)

Fixed In Version:
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Doc Text:
A flaw was discovered in the Linux kernel's implementation of InfiniBand. A local attacker who is able to execute a read from the InfiniBand device could trigger an information leak of kernel memory to userspace which can be used to further attack the system.
Clone Of:
Environment:
Last Closed: 2021-10-25 22:11:50 UTC
Embargoed:

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Description Pedro Sampaio 2019-08-07 22:23:24 UTC 
A flaw was discovered in the Linux kernels implementation of infiniband for MLX5. A local attacker who is able to execute a read from the infiband device could trigger an information leak of kernel memory to userspace which can be used to further attack the system.


Additional Information:
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0625b4ba1a5d4703c7fb01c497bd6c156908af00
Comment 1 Pedro Sampaio 2019-08-07 22:23:42 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1738709]
Comment 2 Justin M. Forbes 2019-08-08 09:27:06 UTC 
This was fixed in Fedora with the 4.18.7 stable kernel update.
Comment 7 Eric Christensen 2019-11-20 16:05:51 UTC 
Mitigation:

If the InfiniBand device is in use, there is no known mitigation for this flaw.  If the InfiniBand device is not in use, the kernel module (mlx5_ib) can be blacklisted and unloaded.
Comment 8 Wade Mealing 2020-02-06 01:57:30 UTC 
This was fixed in rhel-7 in the kernel-3.10.0-1013.el7 release, earlier versions were affected.
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