net: hso: fix NULL-deref on disconnect regression
Summary
UVI-2021-1000049: net: hso: fix NULL-deref on disconnect regression. Affects Kernel versions >= 92028d7a31e55d53e41cff679156b9432cffcb36, < 5c17cfe155d21954b4c7e2a78fa771cebcd86725. No fix is published. How to fix ↓
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Background
The net package in the Linux Kernel is responsible for managing network-related functionality. It includes various drivers and protocols for network communication. One of these drivers is the hso driver, which is used for connecting to High-Speed Packet Access (HSPA) modems. The hso driver allows users to establish and manage connections with these modems, enabling internet access. However, a vulnerability has been discovered in the hso driver that can lead to a NULL-dereference error when disconnecting from a modem.
Vulnerability Detail
The vulnerability in the hso driver occurs when disconnecting from an HSPA modem. Due to a programming error, a NULL-dereference can occur, leading to a system crash or potential privilege escalation. An attacker with local access to the system could exploit this vulnerability to crash the system or execute arbitrary code with kernel privileges. The vulnerability was introduced in Linux Kernel version v4.19.187 and was fixed in version v4.19.189.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix mentioned above as soon as possible.
Conclusion
The net package in the Linux Kernel contains a vulnerability in the hso driver that can result in a NULL-dereference error when disconnecting from an HSPA modem. This vulnerability can lead to system crashes or potential privilege escalation. Users are advised to update their Linux Kernel to version v4.19.189 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a system crash or potential privilege escalation. An attacker with local access to the system could exploit this vulnerability to crash the system or execute arbitrary code with kernel privileges.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it for any open-source vulnerabilities, including this one.
No, this vulnerability requires local access to the system in order to be exploited.
There are no known reports of this vulnerability being exploited in the wild at this time.
No, the only way to fully mitigate the risk is by updating the Linux Kernel to the fixed version.
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