CVE-2018-20855 [Low] | Memory Corruption in Linux Kernel

CVE-2018-20855 is rated Low Risk (21.8/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-03-30	0.33%	0.10%	-0.22%
2	2025-03-29	0.06%	0.33%	+0.27%
3	2024-07-19	—	0.06%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-03-30

0.33%

0.10%

-0.22%

2025-03-29

0.06%

0.33%

+0.27%

2024-07-19

—

0.06%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
3.3	3.1	LOW	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	1.8	1.4	[email protected]
2.1	2.0	LOW	`AV:L/AC:L/Au:N/C:P/I:N/A:N` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:N) No availability impact.	3.9	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

3.3

3.1

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

1.8

1.4

[email protected]

2.1

2.0

LOW

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

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:N): No availability impact.

3.9

2.9

[email protected]

OS Trackers for CVE-2018-20855

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2018-20855 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2018-20855
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2018-20855
`suse`	low	CVE-2018-20855 severity low: SUSE including 273 source package names (cluster-md-kmp-default-4.12.14-120.1, cluster-md-kmp-default-4.12.14-150.32.1, …), 579 product×package rows across 74 product lines (HPE Helion OpenStack 8, SLES for SAP Applications 11 SP3, … (74 product lines)): Fixed 529, Known Not Affected 50.	https://www.suse.com/security/cve/CVE-2018-20855/
`ubuntu`	low	CVE-2018-20855 low priority: Ubuntu including 28 source packages (linux, linux-aws, …), 140 status rows across 5 suites (bionic, disco, trusty, upstream, xenial): DNE 71, not-affected 39, released 28, ignored 2.	https://ubuntu.com/security/CVE-2018-20855

Affected software / configurations for CVE-2018-20855

Vendor	Product	Version	Raw CPE
linux	linux_kernel	< 4.18.7	cpe:2.3:o:linux:linux_kernel::::::::
opensuse	leap	15.0	cpe:2.3:o:opensuse:leap:15.0:::::::*
opensuse	leap	15.1	cpe:2.3:o:opensuse:leap:15.1:::::::*
netapp	active_iq_performance_analytics_services	—	cpe:2.3:a:netapp:active_iq_performance_analytics_services:-:::::::*
netapp	active_iq_unified_manager	>= 9.5	cpe:2.3:a:netapp:active_iq_unified_manager::::::vmware_vsphere::*
netapp	data_availability_services	—	cpe:2.3:a:netapp:data_availability_services:-:::::::*
netapp	element_software	—	cpe:2.3:a:netapp:element_software:-:::::::*

References for CVE-2018-20855

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00055.html	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00056.html	Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7	Mailing List Release Notes Vendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0625b4ba1a5d4703c7fb01c497bd6c156908af00	Mailing List Patch Vendor Advisory
https://github.com/torvalds/linux/commit/0625b4ba1a5d4703c7fb01c497bd6c156908af00	Patch Third Party Advisory
https://security.netapp.com/advisory/ntap-20190905-0002/	Third Party Advisory

URL

CVE-2018-20855

Exploit prediction scoring system (EPSS) score for CVE-2018-20855

Common vulnerability scoring system (CVSS) metrics for CVE-2018-20855

Weakness enumeration for CVE-2018-20855

OS Trackers for CVE-2018-20855

Affected software / configurations for CVE-2018-20855

References for CVE-2018-20855