CVE-2018-20449

The hidma_chan_stats function in drivers/dma/qcom/hidma_dbg.c in the Linux kernel 4.14.90 allows local users to obtain sensitive address information by reading "callback=" lines in a debugfs file.

Published: 2019-04-04 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-20449 is rated Low Risk (34/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.42%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-20449

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.42% +0.35%
2 2025-03-30 0.24% 0.07% -0.17%
3 2025-03-29 — 0.24% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-20449

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.0 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [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]

Weakness enumeration for CVE-2018-20449

OS Trackers for CVE-2018-20449

vendor priority summary link
debian not yet assigned CVE-2018-20449 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-2018-20449
redhat low — https://access.redhat.com/security/cve/CVE-2018-20449
suse low CVE-2018-20449 severity low: SUSE including 9 source package names (kernel-default, kernel-default-base, …), 57 product×package rows across 13 product lines (SLES for SAP Applications 11 SP3, SUSE Linux Enterprise Desktop 12 SP3, … (13 product lines)): Known Not Affected 57. https://www.suse.com/security/cve/CVE-2018-20449/
ubuntu negligible CVE-2018-20449 negligible priority: Ubuntu including 73 source packages (linux, linux-aws, …), 529 status rows across 9 suites (bionic, cosmic, disco, focal, jammy, noble, trusty, upstream, xenial): DNE 315, not-affected 127, released 76, ignored 11. https://ubuntu.com/security/CVE-2018-20449

Affected software / configurations for CVE-2018-20449

Vendor Product Version Raw CPE
linux linux_kernel 4.14.90 cpe:2.3:o:linux:linux_kernel:4.14.90:*:*:*:*:*:*:*
netapp element_software_management_node — cpe:2.3:a:netapp:element_software_management_node:-:*:*:*:*:*:*:*

References for CVE-2018-20449

cvelogic Threat Intelligence