Home CVE Database CVE-2017-1000405

CVE-2017-1000405

Description

The Linux Kernel versions 2.6.38 through 4.14 have a problematic use of pmd_mkdirty() in the touch_pmd() function inside the THP implementation. touch_pmd() can be reached by get_user_pages(). In such case, the pmd will become dirty. This scenario breaks the new can_follow_write_pmd()\'s logic - pmd can become dirty without going through a COW cycle. This bug is not as severe as the original Dirty cow because an ext4 file (or any other regular file) cannot be mapped using THP. Nevertheless, it does allow us to overwrite read-only huge pages. For example, the zero huge page and sealed shmem files can be overwritten (since their mapping can be populated using THP). Note that after the first write page-fault to the zero page, it will be replaced with a new fresh (and zeroed) thp.

Priority: MEDIUM
CVSS v3: 7
Publish Date: Nov 30, 2017
Related ID: --
CVSS v2: High
Modified Date: Dec 5, 2017

Find out more about CVE-2017-1000405 from the MITRE-CVE dictionary and NIST NVD


Products Affected

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Product Name Status Defect Fixed Downloads
Linux
Wind River Linux LTS 17 Fixed LIN10-2716
10.17.41.11 Wind River Linux LTS 10.17.41.11
Wind River Linux LTS 10.17.41.12
Wind River Linux LTS 10.17.41.13
Wind River Linux LTS 10.17.41.14
Wind River Linux LTS 10.17.41.15
Wind River Linux LTS 10.17.41.16
Wind River Linux LTS 10.17.41.17
Wind River Linux LTS 10.17.41.18
Wind River Linux LTS 10.17.41.20
Wind River Linux LTS 10.17.41.21
Wind River Linux LTS 10.17.41.22
Wind River Linux LTS 10.17.41.23
Wind River Linux LTS 10.17.41.24
Wind River Linux 8 Fixed LIN8-8290
8.0.0.24 --
Wind River Linux 9 Fixed LIN9-5938
9.0.0.13 --
Wind River Linux 7 Fixed -- 7.0.0.27 --
Wind River Linux LTS 21 Not Vulnerable -- -- --
Wind River Linux LTS 18 Not Vulnerable -- -- --
Wind River Linux LTS 19 Not Vulnerable -- -- --
Wind River Linux CD release Not Vulnerable -- -- --
VxWorks
VxWorks 7 Not Vulnerable -- -- --
VxWorks 6.9 Not Vulnerable -- -- --

Related Products

Product Name Status Defect Fixed Downloads

Comments

linux


Notes
Requires LTSS - customers must have active LTSS (Long Term Security Shield) Support to receive up-to-date information about vulnerabilities that may affect legacy software. Please contact your Wind River account team or see https://docs.windriver.com/bundle/Support_and_Maintenance_Supplemental_Terms_and_Conditions and https://support2.windriver.com/index.php?page=plc for more information.
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