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

Vulnerability identifier: #VU55527

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2021-1939

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

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

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

• Multiple vulnerabilities in Qualcomm chipsets