CVE-2026-97421
Received Received - Intake

Boundary Condition Handling Flaw in Linux Kernel RDMA/umem

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz() Several corner cases, especially important on 32 bits: - umem->iova is u64, the function argument should pass in u64 or iova will be truncated - Check that the length is not too large for the iova - Check that lengths > 4G don't overflow the GENMASK

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-97421
EUVD
EUVD-2026-86034

Affected Vendors & Products

Currently, no data is known.

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves boundary condition issues in the function ib_umem_find_best_pgsz(). It affects 32-bit systems where the iova (input/output virtual address) could be truncated if passed as a 32-bit value instead of a 64-bit value. Additionally, it checks for potential overflows when handling lengths greater than 4GB.

Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA/umem subsystem and involves boundary conditions in ib_umem_find_best_pgsz(). Detection requires checking if your kernel version includes the vulnerable function and verifying if the described corner cases are present. No direct commands are provided in the context to detect this issue.

Impact Analysis

On 32-bit systems, this vulnerability could lead to memory corruption or crashes due to incorrect handling of large memory regions. It may cause instability or denial of service if exploited maliciously.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a version that resolves this vulnerability. Since the issue is in the kernel's RDMA subsystem, applying the latest stable kernel update is recommended. No specific commands are provided in the context for mitigation.

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