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Bug 1541240 - (CVE-2018-6412) CVE-2018-6412 kernel: Incorrect integer signedness in sbuslibc:sbusfb_ioctl_helper() allows for information leakage
CVE-2018-6412 kernel: Incorrect integer signedness in sbuslibc:sbusfb_ioctl_h...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20180131,reported=2...
: Security
Depends On: 1541241
Blocks: 1541243
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Reported: 2018-02-01 23:34 EST by Sam Fowler
Modified: 2018-02-15 13:37 EST (History)
45 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
In the function sbusfb_ioctl_helper() in drivers/video/fbdev/sbuslib.c in the Linux kernel, up to and including 4.15, an integer signedness error allows arbitrary information leakage for the FBIOPUTCMAP_SPARC and FBIOGETCMAP_SPARC commands.
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Environment:
Last Closed: 2018-02-14 11:12:12 EST
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CRM:
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RHEL 7.3 requirements from Atomic Host:
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Description Sam Fowler 2018-02-01 23:34:20 EST 
In the function sbusfb_ioctl_helper() in drivers/video/fbdev/sbuslib.c in the Linux kernel up to and including 4.15, an integer signedness error allows arbitrary information leakage for the FBIOPUTCMAP_SPARC and FBIOGETCMAP_SPARC commands.

External References:
https://nvd.nist.gov/vuln/detail/CVE-2018-6412

Upstream Patch:
https://marc.info/?l=linux-fbdev&m=151734425901499
Comment 1 Sam Fowler 2018-02-01 23:35:11 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1541241]
Comment 2 Justin M. Forbes 2018-02-02 09:28:51 EST 
Sparc is not a supported architecture for Fedora, so this does not impact Fedora users
Comment 5 Vladis Dronov 2018-02-14 11:12:12 EST 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE, as the code with the flaw is not built and is not shipped with the products listed.
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