Out-of-Bounds Access Vulnerability in spi: bcm2835
Summary
UVI-2021-1000891: spi: bcm2835: Fix out-of-bounds access with more than 4 slaves. Affects Kernel versions >= 571e31fa60b3697d5db26140e16d5c45c51c9815, < b5502580cf958b094f3b69dfe4eece90eae01fbc. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The spi: bcm2835 package is a driver for the SPI controller found on Broadcom BCM2835-based systems. It provides support for communication with SPI devices connected to the system. The vulnerability in this package allows for out-of-bounds access when more than 4 slaves are used.
Vulnerability Detail
The vulnerability arises from a flaw in the spi: bcm2835 driver, which leads to out-of-bounds access when the number of connected SPI devices exceeds 4. This can result in memory corruption or unintended data access, potentially leading to system instability or unauthorized access to sensitive information. The vulnerability was introduced in version v5.4 of the Linux Kernel and has been fixed in version v5.4.126.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As a temporary workaround, users can limit the number of connected SPI devices to 4 or fewer to avoid triggering the out-of-bounds access. This can be achieved by disconnecting or disabling unnecessary SPI devices or by reconfiguring the system to use fewer slaves.
Conclusion
The out-of-bounds access vulnerability in spi: bcm2835 can lead to memory corruption, system instability, or unauthorized access to sensitive information. It is crucial to update the Linux Kernel to version v5.4.126 or later to mitigate this vulnerability. If you need further assistance or support in addressing this vulnerability, please contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The vulnerability can lead to memory corruption, system instability, or unauthorized access to sensitive information.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground and it will provide real-time alerts for open-source vulnerabilities.
At the time of this report, no known exploits for this vulnerability have been reported. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
The recommended approach is to update the Linux Kernel to the fixed version. However, as a temporary workaround, you can limit the number of connected SPI devices to 4 or fewer.
You can find more information about this vulnerability in the Open Source Vulnerability Database (OSVDB) entry: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/UVI-2021-1000891.json
Related vulnerabilities
Recent vulnerabilities recorded for Kernel.
