Vulnerability in Linux Kernel
CVE-2015-8839
Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different user's file after unsynchronized hole punching and page-fault handling.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (26.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Linux Kernel — versions 4.5
- Canonical Ubuntu Linux — versions 14.04, 16.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.ubuntu.com/usn/USN-3006-1 (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1035455 (VDB Entry, Third Party Advisory, vdb-entry)
- github.com/torvalds/linux/commit/ea3d7209ca01da209cda6f0dea8be9cc4b7a933b (Third Party Advisory)
- www.ubuntu.com/usn/USN-3005-1 (vendor-advisory, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Vendor Advisory)
- access.redhat.com/errata/RHSA-2017:2669 (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2016/04/01/4 (mailing-list, Mailing List, Third Party Advisory)
- www.securityfocus.com/bid/85798 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2017:2077 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2015-8839?
- CVE-2015-8839 is a medium-severity vulnerability in Linux Kernel, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.1/10. Published 2016-05-02.
- How severe is CVE-2015-8839?
- Medium severity. CVSS v3 base score is 5.1 out of 10.
- Is CVE-2015-8839 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.