SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2021-35121

An array index is improperly used to lock and unlock a mutex which can lead to a Use After Free condition In the Synx driver in Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

MEDIUM 6.7EPSS 0.15%

Does this matter?

Lower severity and a low EPSS score (0.15%). Track it; it rarely justifies an emergency change on its own.

Description

An array index is improperly used to lock and unlock a mutex which can lead to a Use After Free condition In the Synx driver in Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

CVSS 3.1
6.7 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS
0.15% probability · 4th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-129
Affected
qualcomm/apq8053 firmware · qualcomm/msm8953 firmware · qualcomm/qca6390 firmware · qualcomm/qca6391 firmware · qualcomm/qca6426 firmware · qualcomm/qca6436 firmware · qualcomm/qcm2290 firmware · qualcomm/qcm4290 firmware · qualcomm/qcs2290 firmware · qualcomm/qcs4290 firmware · qualcomm/qrb5165 firmware · qualcomm/qrb5165m firmware · qualcomm/qrb5165n firmware · qualcomm/sd460 firmware · qualcomm/sd662 firmware · qualcomm/sd680 firmware · qualcomm/sd690 5g firmware · qualcomm/sd750g firmware · qualcomm/sd765 firmware · qualcomm/sd765g firmware · +24 more
Source
product-security@qualcomm.com
EPSS trend
0%3%5%26 October 2026: 0.15%26 October 202626 October 2026

EPSS 0.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.