The syscons CONS_SCRSHOT ioctl in FreeBSD 5.x allows local users to read arbitrary kernel memory via (1) negative coordinates or (2) large coordinates.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17584
http://www.securityfocus.com/bid/11321
http://www.kb.cert.org/vuls/id/969078
http://secunia.com/advisories/12722
Source: Mitre, NVD
Published: 2004-12-31
Updated: 2017-07-11
Base Score: 4.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P
Severity: Medium
Base Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N