CVE-2026-74397
Received Received - Intake

Transport Domain Leak in Linux Kernel mlx5 Driver

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier mlx5_ib_alloc_transport_domain() allocates a transport domain and then may fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked. Fix this by deallocating the TD when mlx5_ib_enable_lb() returns an error. Also return 0 explicitly in the no-loopback-capability success branch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init().

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74397
EUVD
EUVD-2026-59544

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mlx linux_kernel *

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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 is a Linux kernel vulnerability affecting the mlx5 InfiniBand driver. It involves a resource leak where a transport domain is not properly deallocated if an error occurs during loopback mode initialization. The fix ensures the transport domain is freed on failure and moves mutex initialization earlier to prevent race conditions.

Impact Analysis

If exploited, this could lead to resource exhaustion in the kernel, causing system instability or crashes. It may also allow local attackers to trigger denial-of-service conditions by consuming kernel resources.

Mitigation Strategies

Update the Linux kernel to the patched version where this vulnerability is resolved. Check your distribution's security advisories for the specific kernel version that includes the fix for CVE-2026-74397.

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