IBM AIX 7.1, 7.2, and VIOS 3.1 could allow a local user to exploit a vulnerability in the ksu user command to gain root privileges.

published 2020-12-10 5y ago modified 2026-06-17 4mo ago also EUVD-2020-26076

cvss: 8.4; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

IBM AIX 7.1, 7.2, and VIOS 3.1 could allow a local user to exploit a vulnerability in the ksu user command to gain root privileges. IBM X-Force ID: 189960.

Patch / fix

links 1

ibm.com/support/pages/node/6380430 advisory

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Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.4	CVSS:3.0/AC:L/PR:N/A:H/I:H/AV:L/S:U/UI:N/C:H/RL:O/RC:C/E:U
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA	3.0	8.4	CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

IBM VIOS
IBM AIX

References

ibm.com /support/pages/node/6380430
patch, vendor-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/189960
vdb-entry, vendor-advisory

Sources

CVE List CVE-2020-4829
NVD CVE-2020-4829

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