CVE-2016-1886

Severity: high (CVSS 7.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2016-05-25 · updated 2026-06-17
Weakness: CWE-119

Description

Integer signedness error in the genkbd_commonioctl function in sys/dev/kbd/kbd.c in FreeBSD 9.3 before p42, 10.1 before p34, 10.2 before p17, and 10.3 before p3 allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory overwrite and kernel crash), or gain privileges via a negative value in the flen structure member in the arg argument in a SETFKEY ioctl call, which triggers a "two way heap and stack overflow."

Affected products

FreeBSD: 9.3, 10.1, 10.2, 10.3

References

http://cturt.github.io/SETFKEY.html
http://www.securityfocus.com/bid/90734
http://www.securitytracker.com/id/1035905
https://security.FreeBSD.org/patches/SA-16:18/atkbd.patch
https://www.freebsd.org/security/advisories/FreeBSD-SA-16:18.atkbd.asc
http://cturt.github.io/SETFKEY.html
http://www.securityfocus.com/bid/90734
http://www.securitytracker.com/id/1035905
https://security.FreeBSD.org/patches/SA-16:18/atkbd.patch
https://www.freebsd.org/security/advisories/FreeBSD-SA-16:18.atkbd.asc

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