CVE-2017-1000405
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2017-1000405
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2017-1000405.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2017-1000405
- Related
- Published
- 2017-11-30T22:29:00Z
- Modified
- 2024-09-11T02:00:04Z
- Severity
-
- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
The Linux Kernel versions 2.6.38 through 4.14 have a problematic use of pmdmkdirty() in the touchpmd() function inside the THP implementation. touchpmd() can be reached by getuserpages(). In such case, the pmd will become dirty. This scenario breaks the new canfollowwritepmd()'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.
- References
-
- http://www.securityfocus.com/bid/102032
- http://www.securitytracker.com/id/1040020
- https://access.redhat.com/errata/RHSA-2018:0180
- https://www.exploit-db.com/exploits/43199/
- https://medium.com/bindecy/huge-dirty-cow-cve-2017-1000405-110eca132de0
- https://source.android.com/security/bulletin/pixel/2018-02-01
- https://security-tracker.debian.org/tracker/CVE-2017-1000405
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source