The cifs_close function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer dereference and BUG) or possibly have unspecified other impact by setting the O_DIRECT flag during an attempt to open a file on a CIFS filesystem.
http://marc.info/?l=linux-cifs&m=130204357001849&w=2
http://marc.info/?l=linux-cifs&m=130204730006155&w=2
http://securityreason.com/securityalert/8367
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
Source: MITRE
Published: 2011-09-06
Updated: 2020-07-27
Type: CWE-476
Base Score: 4.4
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 7.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH