CVE-2026-21369: Memory Corruption when handling flash commands due to outdated LED count values being used after userspace mod
19
Routine
MEDIUM 5.3MITIGATEMITIGATEMITIGATE
CVE-2026-21369 is a medium-severity flaw (CVSS 5.3) affecting fastconnect 6200 firmware, fastconnect 6700 firmware, fastconnect 6900 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Memory Corruption when handling flash commands due to outdated LED count values being used after userspace modification.
Why this priority
No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
qualcomm fastconnect 6200 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
qualcomm fastconnect 6700 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
qualcomm fastconnect 6900 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
qualcomm fastconnect 7800 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
qualcomm g1 gen 1 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
qualcomm wcd9380 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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 sourceNVD · 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-2026-21369?
fastconnect 6200 firmware: mitigate or apply the listed mitigation; fastconnect 6700 firmware: mitigate or apply the listed mitigation; fastconnect 6900 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-21369 being exploited?
CVE-2026-21369 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-2026-21369 affect?
CVE-2026-21369 affects fastconnect 6200 firmware, fastconnect 6700 firmware, fastconnect 6900 firmware. Severity is medium (CVSS 5.3). Memory Corruption when handling flash commands due to outdated LED count values being used after userspace modification.
CVE-2026-21379HIGH 7.8MITIGATEMITIGATE Memory Corruption when allocating memory with sizes that exceed the maximum allowed value.
CVE-2026-24079HIGH 8.1MITIGATEMITIGATE Cryptographic Issue while processing registration requests with malformed or missing authentication parameters
CVE-2026-24076MEDIUM 6.7MITIGATEMITIGATE Memory Corruption when processing registry values with incorrect types using a direct query method.
CVE-2026-24077MEDIUM 6.5MITIGATEMITIGATE Information Disclosure when processing wireless network channel switch information with improperly formatted l
CVE-2026-24078MEDIUM 6.5MITIGATEMITIGATE Information Disclosure when IPSec negotiation fails or is not established properly during NG-eCall SIP signali
PatchTheCVE