CVE-2026-21103: Path traversal in GalaxyDiagnostics prior to SMR Sep-2026 Release 1 allows physical attackers to access files

Routine

MEDIUM 6.1MITIGATE

CVE-2026-21103 is a medium-severity flaw (CVSS 6.1) affecting android. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Path traversal in GalaxyDiagnostics prior to SMR Sep-2026 Release 1 allows physical attackers to access files with system privilege.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-35
Published	2026-09-09
Last modified	2026-09-10

Publisher (CNA): Samsung Mobile · Vendor: samsung

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-09 05:17 UTCPublished CVE record published
2026-09-10 20:40 UTCUpdated Record last modified

samsung android MITIGATE

Affected: 14.0 · 14.0 smr-apr-2022-r1 · 14.0 smr-apr-2023-r1 · 14.0 smr-apr-2024-r1 · 14.0 smr-apr-2025-r1 · 14.0 smr-apr-2026-r1 · 14.0 smr-aug-2022-r1 · 14.0 smr-aug-2023-r1

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21103?

android: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-21103 being exploited?

CVE-2026-21103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21103 affect?

CVE-2026-21103 affects android. Severity is medium (CVSS 6.1). Path traversal in GalaxyDiagnostics prior to SMR Sep-2026 Release 1 allows physical attackers to access files with system privilege.

How urgent is CVE-2026-21103?

Priority 25/100. No elevated risk signals yet.

Software pages

Android vulnerabilities · Samsung vulnerabilities

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References

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