#VU64978 Use-after-free in Qualcomm products - CVE-2021-35133

Vulnerability identifier: #VU64978

Vulnerability risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-35133

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
AR8035
Mobile applications / Mobile firmware & hardware
QCA6391
Mobile applications / Mobile firmware & hardware
QCA8081
Mobile applications / Mobile firmware & hardware
QCA8337
Mobile applications / Mobile firmware & hardware
QCM6490
Mobile applications / Mobile firmware & hardware
QCS6490
Mobile applications / Mobile firmware & hardware
SD 8 Gen1 5G
Mobile applications / Mobile firmware & hardware
SD480
Mobile applications / Mobile firmware & hardware
SD780G
Mobile applications / Mobile firmware & hardware
SD888 5G
Mobile applications / Mobile firmware & hardware
SDX12
Mobile applications / Mobile firmware & hardware
SDX65
Mobile applications / Mobile firmware & hardware
WCD9335
Mobile applications / Mobile firmware & hardware
WCD9341
Mobile applications / Mobile firmware & hardware
WCD9370
Mobile applications / Mobile firmware & hardware
WCD9375
Mobile applications / Mobile firmware & hardware
WCD9380
Mobile applications / Mobile firmware & hardware
WCD9385
Mobile applications / Mobile firmware & hardware
WCN3988
Mobile applications / Mobile firmware & hardware
WCN3991
Mobile applications / Mobile firmware & hardware
WCN6740
Mobile applications / Mobile firmware & hardware
WCN6750
Mobile applications / Mobile firmware & hardware
WCN6850
Mobile applications / Mobile firmware & hardware
WCN6851
Mobile applications / Mobile firmware & hardware
WCN6855
Mobile applications / Mobile firmware & hardware
WCN6856
Mobile applications / Mobile firmware & hardware
WCN7850
Mobile applications / Mobile firmware & hardware
WCN7851
Mobile applications / Mobile firmware & hardware
WSA8830
Mobile applications / Mobile firmware & hardware
WSA8835
Mobile applications / Mobile firmware & hardware
QCA6174A
Hardware solutions / Firmware
QCA9377
Hardware solutions / Firmware
SM7450
Hardware solutions / Firmware
SM8475
Hardware solutions / Firmware
SM8475P
Hardware solutions / Firmware
WSA8832
Hardware solutions / Firmware

Vendor: Qualcomm

Description

The vulnerability allows a local application to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the synx driver. A local application can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AR8035: All versions

QCA6174A: All versions

QCA6391: All versions

QCA8081: All versions

QCA8337: All versions

QCA9377: All versions

QCM6490: All versions

QCS6490: All versions

SD 8 Gen1 5G: All versions

SD480: All versions

SD780G: All versions

SD888 5G: All versions

SDX12: All versions

SDX65: All versions

SM7450: All versions

SM8475: All versions

SM8475P: All versions

WCD9335: All versions

WCD9341: All versions

WCD9370: All versions

WCD9375: All versions

WCD9380: All versions

WCD9385: All versions

WCN3988: All versions

WCN3991: All versions

WCN6740: All versions

WCN6750: All versions

WCN6850: All versions

WCN6851: All versions

WCN6855: All versions

WCN6856: All versions

WCN7850: All versions

WCN7851: All versions

WSA8830: All versions

WSA8832: All versions

WSA8835: All versions

---

External links
https://docs.qualcomm.com/product/publicresources/securitybulletin/july-2022-bulletin.html
https://source.codeaurora.org/quic/la/kernel/msm-5.4/commit/?id=f0c81db62df752bd9004df796212e13ee75bd933

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.