NULL pointer dereference in Linux kernel - CVE-2021-47331
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90493
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-2021-47331
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the usb_charger_get_property() and usb_conn_probe() functions in drivers/usb/common/usb-conn-gpio.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-47331
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.52, 5.12.19, 5.13.4, 5.14
External References
- https://git.kernel.org/stable/c/8e8d910e9a3a7fba86140aff4924c30955ab228b
- https://git.kernel.org/stable/c/436906fd248e018403bcda61a9311d9af02912f1
- https://git.kernel.org/stable/c/1a133a0996d6b4c83509d570ed4edcba34c44f25
- https://git.kernel.org/stable/c/880287910b1892ed2cb38977893b947382a09d21
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.52
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.19
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14