CVE-2021-47073 platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios
A logic error in the Dell SMBIOS WMI driver causes a kernel oops when the module is removed on unsupported systems, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47073?
CVE-2021-47073 is a medium-severity vulnerability in Linux kernel, published on 1 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios
init_dell_smbios_wmi() only registers the dell_smbios_wmi_driver on systems where the Dell WMI interface is supported. While exit_dell_smbios_wmi() unregisters it unconditionally, this leads to the following oops:
[ 175.722921] ------------[ cut here ]------------ [ 175.722925] Unexpected driver unregister! [ 175.722939] WARNING: CPU: 1 PID: 3630 at drivers/base/driver.c:194 driver_unregister+0x38/0x40 ... [ 175.723089] Call Trace: [ 175.723094] cleanup_module+0x5/0xedd [dell_smbios] ... [ 175.723148] ---[ end trace 064c34e1ad49509d ]---
Make the unregister happen on the same condition the register happens to fix this.
Which versions are affected by CVE-2021-47073?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47073?
Apply the vendor's patch.
Is CVE-2021-47073 being exploited?
There is no known exploitation of CVE-2021-47073 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47073, GHSA-ccpq-qrrm-9f6q, UBUNTU-CVE-2021-47073.