tss_alloc in sys/arch/i386/i386/gdt.c in OpenBSD 6.2 and 6.3 has a Local Denial of Service (system crash) due to incorrect I/O port access…

published 2018-08-01 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-6659

cvss: 5.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

tss_alloc in sys/arch/i386/i386/gdt.c in OpenBSD 6.2 and 6.3 has a Local Denial of Service (system crash) due to incorrect I/O port access control on the i386 architecture.

Patch / fix

links 4

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.5	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	4.9	AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

CWE-20 Improper Input Validation

References

cvsweb.openbsd.org /cgi-bin/cvsweb/src/sys/arch/i386/i386/gdt.c.diff?r1=1.37&r2=1.37.8.1&f=h
patch, vendor-advisory
ftp.openbsd.org /pub/OpenBSD/patches/6.3/common/015_ioport.patch.sig
patch, vendor-advisory
ftp.openbsd.org /pub/OpenBSD/patches/6.2/common/020_ioport.patch.sig
patch, vendor-advisory
cvsweb.openbsd.org /cgi-bin/cvsweb/src/sys/arch/i386/i386/gdt.c
issue-tracking, patch, vendor-advisory
securitytracker.com /id/1041550
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-14775
NVD CVE-2018-14775

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary