Shift-out-of-bound Vulnerability in nvmem Package
Summary
UVI-2021-1001953: nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells. Affects Kernel versions >= 69aba7948cbe53f2f1827e84e9dd0ae470a5072e, < 2df6c023050205c4d04ffc121bc549f65cb8d1df. 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 nvmem package is a component of the Linux Kernel ecosystem. It provides an interface for accessing non-volatile memory devices. Non-volatile memory (NVM) is a type of computer memory that can retain stored information even when power is removed. The nvmem package allows applications to read from and write to NVM devices. It is an essential component for various functionalities in the Linux Kernel.
Vulnerability Detail
The shift-out-of-bound vulnerability in the nvmem package allows for undefined behavior and potential security risks. Specifically, when byte size cells are used, the vulnerability arises due to a shift operation that goes beyond the bounds of the allocated memory. This vulnerability was introduced in version v4.3 of the Linux Kernel and has been fixed in version v4.14.252. The impact and attack plausibility of this vulnerability have not been proven yet.
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 workaround, developers can manually modify the affected code in the nvmem package to prevent the shift-out-of-bound vulnerability. The following code snippet demonstrates the necessary modification:
// Original code
...
shift = value << 8;
...
// Modified code
...
shift = (value & 0xFF) << 8;
...
Conclusion
The shift-out-of-bound vulnerability in the nvmem package of the Linux Kernel can be mitigated by updating to version v4.14.252 or later. Alternatively, developers can apply the provided workaround to modify the affected code. For further support and assistance in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The nvmem package is a component of the Linux Kernel ecosystem that provides an interface for accessing non-volatile memory devices.
Non-volatile memory is a type of computer memory that can retain stored information even when power is removed.
The impact of this vulnerability is currently unknown. It may lead to undefined behavior and potential security risks, but no specific attack scenarios have been proven yet.
To fix this vulnerability, update the Linux Kernel to version v4.14.252 or later, which includes the necessary patch to address the issue.
Yes, developers can modify the affected code in the nvmem package to prevent the shift-out-of-bound vulnerability. Refer to the provided code snippet for the necessary modification.
Related vulnerabilities
Recent vulnerabilities recorded for Kernel.
