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Bug 1518638 - (CVE-2017-17053) CVE-2017-17053 kernel: Incorrect handling in arch/x86/include/asm/mmu_context.h:init_new_context function allowing use-after-free
CVE-2017-17053 kernel: Incorrect handling in arch/x86/include/asm/mmu_context...
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=20170824,repor...
: Security
Depends On: 1543353 1518642 1543352 1543354
Blocks: 1518639
  Show dependency tree / graph
 
Reported: 2017-11-29 06:33 EST by Adam Mariš
Modified: 2018-08-28 18:26 EDT (History)
45 users (show)

See Also:
Fixed In Version: kernel 4.13
Doc Type: Bug Fix
Doc Text:
The init_new_context function in arch/x86/include/asm/mmu_context.h in the Linux kernel, before 4.12.10, does not correctly handle errors from LDT table allocation when forking a new process. This could allow a local attacker to achieve a use-after-free or possibly have unspecified other impact by running a specially crafted program.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0676 None None None 2018-04-10 04:10 EDT

  None (edit)
Description Adam Mariš 2017-11-29 06:33:11 EST 
The init_new_context function in arch/x86/include/asm/mmu_context.h in the Linux kernel before 4.12.10 does not correctly handle errors from LDT table allocation when forking a new process, allowing a local attacker to achieve a use-after-free or possibly have unspecified other impact by running a specially crafted program.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ccd5b3235180eef3cfec337df1c8554ab151b5cc
Comment 1 Adam Mariš 2017-11-29 06:45:26 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1518642]
Comment 2 Justin M. Forbes 2017-11-29 12:12:28 EST 
Fedora hasn't supported a 4.12.x kernel in quite some time. Current kernels are 4.13.16 across all supported releases.
Comment 6 Vladis Dronov 2018-02-08 05:33:12 EST 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and 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 a code with the flaw is not present or is not built in the products listed.
Comment 7 errata-xmlrpc 2018-04-10 04:09:54 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676
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