In the Linux kernel before 4.15, fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tree during read operations in DIRECT mode, which allows local users to cause a denial of service (BUG) by modifying a certain e_cpos field.
http://www.securityfocus.com/bid/103353
https://github.com/torvalds/linux/commit/3e4c56d41eef5595035872a2ec5a483f42e8917f
Source: MITRE
Published: 2018-03-12
Updated: 2018-05-03
Type: CWE-362
Base Score: 1.9
Vector: AV:L/AC:M/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 3.4
Severity: LOW
Base Score: 4.7
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1
Severity: MEDIUM