CVE-2021-30316

Out-of-bounds memory access via HSYNC fence boundary

Published Oct 20, 2021 · Updated Aug 3, 2024

Out-of-range pointer offset in Qualcomm Snapdragon multimedia drivers allows local users to access memory while creating an HSYNC fence. The HSYNC fence creation path applies an improper boundary check, allowing a pointer offset to move beyond the valid memory region. Exploitation requires local access but no prior privileges or user interaction; Qualcomm does not disclose whether the access is a read or write.

CVSS severity8.4
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-range pointer offset in Qualcomm Snapdragon multimedia drivers allows local users to access memory while creating an HSYNC fence. The HSYNC fence creation path applies an improper boundary check, allowing a pointer offset to move beyond the valid memory region. Exploitation requires local access but no prior privileges or user interaction; Qualcomm does not disclose whether the access is a read or write.

The record

CVE
CVE-2021-30316
Published
Oct 20, 2021
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-823
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=AR8031, CSRA6620, CSRA6640, FSM10055, FSM10056, MDM9150, QCA6174A, QCA6391, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595, QCA6595AU, QCA6696, QCA9377, QCM6490, QCS405, QCS410, QCS610, QCS6490, QCX315, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SD 675, SD480, SD660, SD675, SD678, SD720G, SD778G, SD780G, SD888, SD888 5G, SDA429W, SDX12, SDX55, SM6250, SM7315, SM7325P, WCD9335, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3620, WCN3660B, WCN3680B, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WSA8810, WSA8815, WSA8830, WSA8835

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=AR8031, CSRA6620, CSRA6640, FSM10055, FSM10056, MDM9150, QCA6174A, QCA6391, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595, QCA6595AU, QCA6696, QCA9377, QCM6490, QCS405, QCS410, QCS610, QCS6490, QCX315, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SD 675, SD480, SD660, SD675, SD678, SD720G, SD778G, SD780G, SD888, SD888 5G, SDA429W, SDX12, SDX55, SM6250, SM7315, SM7325P, WCD9335, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3620, WCN3660B, WCN3680B, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WSA8810, WSA8815, WSA8830, WSA8835

Published CVSS scores

8.4QualcommCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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