CVE-2021-1974

Possible buffer over read due to lack of alignment between map or unmap length of IPA SMMU and...

7.5 HighFix available

Possible buffer over read due to lack of alignment between map or unmap length of IPA SMMU and WLAN SMMU in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.59%Up 0.2 points since Sep 9, 2021

What each source reports

CVE List Score used 7.5

Record: CVE-2021-1974
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

EUVDEUVD-2021-7438 7.5

Record: EUVD-2021-7438
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-55x4-8xjx-px24 No score

Possible buffer over read due to lack of alignment between map or unmap length of IPA SMMU and...

Record: GHSA-55x4-8xjx-px24
Weakness: CWE-125
Updated: 2026-11-02

NVD 7.5

Record: CVE-2021-1974
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-125
Updated: 2026-11-02

Affected products

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Affected packages

Affected packages
Package	Affected	Fixed
`platform/vendor/qcom-opensource/wlan/qca-wifi-host-cmn` Android	SoCVersion:0 up to SoCVersion:2021-09-05, plus listed versions SoCVersion	SoCVersion:2021-09-05

History

History
Recorded	Changed	Sources
Nov 5, 2026	facts	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-1974 is a high vulnerability (CVSS 7.5) in Qualcomm, Inc. Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Iot, Snapdragon Industrial Iot, Snapdragon Mobile, Snapdragon Wearables, Snapdragon Wired Infrastructure And Networking, published September 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in platform/vendor/qcom-opensource/wlan/qca-wifi-host-cmn SoCVersion:2021-09-05.