NULL pointer dereference in Qualcomm products - CVE-2021-1939

Vulnerability identifier: #VU55527

CSH Severity: Low

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

CVE-ID: CVE-2021-1939

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerable software:
APQ8009
APQ8017
APQ8053
MSM8909W
MSM8917
MSM8953
QCA6174A
QCA6574AU
QCA9377
QCA9379
QCS605
SA6155P
SD675
SD205
SD210
SD450
SD665
SD670
SD730
SD845
SD855
SD888
SDM429W
SDX24
SDX55
APQ8009W
AQT1000
QCA4020
QCA6310
QCA6335
QCA6390
QCA6391
QCA6420
QCA6421
QCA6426
QCA6430
QCA6431
QCA6436
QCA6574
QCA6574A
QCA6595AU
QCA6696
QCS603
QET4101
QSM8250
QSW8573
Qualcomm215
SA6145P
SA6150P
SA6155
SA8145P
SA8150P
SA8155
SA8155P
SA8195P
SD429
SD439
SD480
SD632
SD678
SD6905G
SD750G
SD765
SD765G
SD768G
SD778G
SD780G
SD8655G
SD870
SD8885G
SDA429W
SDM830
SDX55M
SDXR1
SDXR25G
SM4125
SM7250
SM7325
WCD9335
WCD9340
WCD9370
WCD9371
WCD9375
WCD9380
WCD9385
WCN3610
WCN3615
WCN3620
WCN3660
WCN3660B
WCN3680
WCN3680B
WCN3910
WCN3950
WCN3988
WCN3991
WCN3998
WCN6740
WCN6750
WCN6850
WCN6851
WCN6855
WCN6856
WSA8810
WSA8815
WSA8830
WSA8835

Software vendor:
Qualcomm

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the kernel graphics driver, when the preemption feature enablement is toggled. A local user can run a specially crafted program and perform a denial of service (DoS) attack.

Install updates from vendor's website.

• https://www.qualcomm.com/company/product-security/bulletins/august-2021-bulletin
• https://source.codeaurora.org/quic/la/kernel/msm-4.9/commit/?id=8f7797dcdc8457fb0fae528efd72bacf2090f380