CVE-2026-21104: Heap-based buffer overflow in KnoxVault trustlet prior to SMR Sep-2026 Release 1 allows local privileged attac

Routine

MEDIUM 6.7MITIGATE

CVE-2026-21104 is a medium-severity flaw (CVSS 6.7) affecting android. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in KnoxVault trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-09
Last modified	2026-09-11

Publisher (CNA): Samsung Mobile · Vendor: samsung

Last updated 2026-09-11 · 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
2026-09-11 04:17 UTCUpdated Record last modified

samsung android MITIGATE

Affected: 15.0 · 15.0 smr-apr-2025-r1 · 15.0 smr-apr-2026-r1 · 15.0 smr-aug-2025-r1 · 15.0 smr-aug-2026-r1 · 15.0 smr-dec-2025-r1 · 15.0 smr-feb-2025-r1 · 15.0 smr-feb-2026-r1

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.0

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-2026-21104?

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

Is CVE-2026-21104 being exploited?

CVE-2026-21104 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-2026-21104 affect?

CVE-2026-21104 affects android. Severity is medium (CVSS 6.7). Heap-based buffer overflow in KnoxVault trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code.

How urgent is CVE-2026-21104?

Priority 24/100. No elevated risk signals yet.

Software pages

Android vulnerabilities · Samsung vulnerabilities

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References

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