CVE-2017-1000405Not scoredCWE-362

CVE-2017-1000405: Linux Kernel vulnerability

Linux · Linux Kernel

Vendor fix available · Affected: Linux Kernel · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.8%probability of exploitation in the next 30 days

86th percentile

050100

Higher than 86% of scored CVEs

Not scored yet. The CVE record carries no CVSS score.

DescriptionCVE.org

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.

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Race Condition · Race Conditions
Vendor: Linux
Published: November 2017
Band: Possible (1 to 10%), November 2017

CoverageNo articles yet

No CyberSIXT article names CVE-2017-1000405 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.