Use-after-free bug in RDMA/hfi1 for mm struct
Summary
GSD-2022-1001675: RDMA/hfi1: Fix use-after-free bug for mm struct. Affects Kernel versions >= 3d2a9d642512c21a12d19b9250e7a835dcb41a79, < 9ca11bd8222a612de0d2f54d050bfcf61ae2883f. No fix is published. How to fix ↓
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Background
The RDMA/hfi1 package is a component of the Linux Kernel that provides support for Remote Direct Memory Access (RDMA) over the HFI1 InfiniBand driver. RDMA allows for high-speed data transfers between remote systems without involving the CPU. The mm struct is a data structure in the Linux Kernel that represents a memory mapping. It keeps track of memory regions and their associated permissions. The vulnerability in RDMA/hfi1 allows for a use-after-free bug in the mm struct, which can lead to memory corruption and potentially be exploited by an attacker.
Vulnerability Detail
The use-after-free bug in RDMA/hfi1 occurs when a reference to the mm struct is used after it has been freed. This can happen if the mm struct is freed while there are still references to it. An attacker could potentially exploit this vulnerability to gain unauthorized access to sensitive information or execute arbitrary code. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Linux Kernel version v5.10 by commit 3d2a9d642512c21a12d19b9250e7a835dcb41a79 and has been fixed in version v5.15.34 by commit 9ca11bd8222a612de0d2f54d050bfcf61ae2883f.
How To Fix
No fixed version is published for this vulnerability.
To fix the use-after-free bug in RDMA/hfi1, it is recommended to update the Linux Kernel to version v5.15.34 or later. This can be done by pulling the latest changes from the official Linux Kernel repository: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
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Conclusion
The use-after-free bug in RDMA/hfi1 for the mm struct can lead to memory corruption and potential exploitation by an attacker. It is recommended to update the Linux Kernel to version v5.15.34 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
RDMA/hfi1 is a component of the Linux Kernel that provides support for Remote Direct Memory Access (RDMA) over the HFI1 InfiniBand driver. It enables high-speed data transfers between remote systems without involving the CPU.
A use-after-free bug occurs when a program or system continues to use a memory reference after it has been freed. This can lead to memory corruption and potentially be exploited by an attacker.
The mm struct is a data structure in the Linux Kernel that represents a memory mapping. It keeps track of memory regions and their associated permissions.
If an attacker can trigger the use-after-free bug in RDMA/hfi1, they may be able to gain unauthorized access to sensitive information or execute arbitrary code.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
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