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Bug 1525222 - (CVE-2017-15128) CVE-2017-15128 kernel: Out of bound access in hugetlb_mcopy_atomic_pte function in mm/hugetlb.c
CVE-2017-15128 kernel: Out of bound access in hugetlb_mcopy_atomic_pte functi...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20171208,repor...
: Security
Depends On: 1545043 1545044
Blocks: 1518303
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Reported: 2017-12-12 15:06 EST by Pedro Sampaio
Modified: 2018-08-28 18:27 EDT (History)
46 users (show)

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Doc Text:
A flaw was found in the Linux kernel where a local user with a shell account can abuse the userfaultfd syscall when using hugetlbfs. A missing size check in hugetlb_mcopy_atomic_pte could create an invalid inode variable, leading to a kernel panic.
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RHEL 7.3 requirements from Atomic Host:
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Description Pedro Sampaio 2017-12-12 15:06:23 EST 
A flaw was found in Linux kernel. A lack of size check in hugetlb_mcopy_atomic_pte could cause denial of service.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1e3921471354244f70fe268586ff94a97a6dd4df

References:

https://marc.info/?l=linux-mm&m=150819356125109
Comment 1 Salvatore Bonaccorso 2018-01-08 14:47:50 EST 
Hi Pedro,

The link referenced is not accessible, is this issue https://marc.info/?l=linux-mm&m=150819356125109 and fixed with upstream 1e3921471354244f70fe268586ff94a97a6dd4df ?

Regards,
Salvatore
Comment 2 Pedro Sampaio 2018-01-08 15:12:52 EST 
Hi Salvatore,

Yes, I believe so. I didn't realize the link wasn't public.

Thanks.
Comment 3 Salvatore Bonaccorso 2018-01-10 14:47:01 EST 
Hi Pedro,

Many thanks for confirming!

Regards,
Salvatore
Comment 8 Eric Christensen 2018-01-23 10:32:04 EST 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6 and kernel-alt.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, realtime and MRG-2. Future Linux kernel updates for the respective releases may address this issue.
Comment 11 Wade Mealing 2018-02-14 01:45:09 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1545043]
Comment 12 Wade Mealing 2018-02-14 01:45:16 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1545044]
Comment 13 Justin M. Forbes 2018-02-14 09:42:14 EST 
This was fixed for Fedora with the 4.13.12 stable updates.
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