CVE-2026-21371: Memory Corruption when retrieving output buffer with insufficient size validation.

Routine

HIGH 7.8MITIGATEMITIGATEMITIGATE

CVE-2026-21371 is a high-severity flaw (CVSS 7.8) affecting snapdragon 8cx compute platform \"poipu pro\" firmware, snapdragon 8cx gen 2 5g compute platform firmware, snapdragon 8cx gen 2 5g compute platform \"poipu pro\" firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Memory Corruption when retrieving output buffer with insufficient size validation.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-126
Published	2026-04-06
Last modified	2026-10-26

Publisher (CNA): Qualcomm, Inc. · Vendor: qualcomm

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 16:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

qualcomm snapdragon 8cx compute platform \"poipu pro\" 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 snapdragon 8cx gen 2 5g compute platform 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 snapdragon 8cx gen 2 5g compute platform \"poipu pro\" 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 snapdragon 8cx gen 3 compute platform 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 wcd9340 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 snapdragon 8cx compute platform 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 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-2026-21371?

snapdragon 8cx compute platform \"poipu pro\" firmware: mitigate or apply the listed mitigation; snapdragon 8cx gen 2 5g compute platform firmware: mitigate or apply the listed mitigation; snapdragon 8cx gen 2 5g compute platform \"poipu pro\" firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-21371 being exploited?

CVE-2026-21371 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-2026-21371 affect?

CVE-2026-21371 affects snapdragon 8cx compute platform \"poipu pro\" firmware, snapdragon 8cx gen 2 5g compute platform firmware, snapdragon 8cx gen 2 5g compute platform \"poipu pro\" firmware. Severity is high (CVSS 7.8). Memory Corruption when retrieving output buffer with insufficient size validation.

How urgent is CVE-2026-21371?

Priority 27/100. High severity

Software pages

Qualcomm vulnerabilities

References

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