CVE-2018-1063 [Medium] | Security Vulnerability in Enterprise Linux

Context relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing). The issue was found in policycoreutils 2.5-11.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.06%	0.39%	+0.33%
2	2025-03-17	0.04%	0.06%	+0.02%
3	2023-03-07	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.06%

0.39%

+0.33%

2025-03-17

0.04%

0.06%

+0.02%

2023-03-07

—

0.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.4	3.0	MEDIUM	`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	1.8	2.5	[email protected]
3.3	2.0	LOW	`AV:L/AC:M/Au:N/C:P/I:P/A:N` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	3.4	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.4

3.0

MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

1.8

2.5

[email protected]

3.3

2.0

LOW

AV:L/AC:M/Au:N/C:P/I:P/A:N Click to expand

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

3.4

4.9

[email protected]

OS Trackers for CVE-2018-1063

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2018-1063 not yet assigned priority: Debian including 1 source packages (policycoreutils), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2018-1063
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2018-1063
`suse`	medium	CVE-2018-1063 severity moderate: SUSE including 310 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 381 product×package rows across 52 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (52 product lines)): Known Affected 231, Fixed 116, Known Not Affected 34.	https://www.suse.com/security/cve/CVE-2018-1063/
`ubuntu`	low	CVE-2018-1063 low priority: Ubuntu including 1 source packages (policycoreutils), 20 status rows across 20 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 16, needed 2, ignored 1, released 1.	https://ubuntu.com/security/CVE-2018-1063

Affected software / configurations for CVE-2018-1063

Vendor	Product	Version	Raw CPE
redhat	enterprise_linux	7.0	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
selinux_project	selinux	—	cpe:2.3:a:selinux_project:selinux:-:::::::*

References for CVE-2018-1063

URL	Tags
https://access.redhat.com/errata/RHSA-2018:0913
https://bugzilla.redhat.com/show_bug.cgi?id=1550122	Issue Tracking Mitigation Vendor Advisory

URL

CVE-2018-1063

Exploit prediction scoring system (EPSS) score for CVE-2018-1063

Common vulnerability scoring system (CVSS) metrics for CVE-2018-1063

Weakness enumeration for CVE-2018-1063

OS Trackers for CVE-2018-1063

Affected software / configurations for CVE-2018-1063

References for CVE-2018-1063