What’s Vulnerable › Vulnerabilities

CVE-2026-74397: IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-30

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().

Affected products

• Linux: 4.5 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2c3b2667dad69d56774b79db763acb3a1bee0fc0
• https://git.kernel.org/stable/c/37fc3cc0f924fd8d0f0cf87b92672dec75a32e57
• https://git.kernel.org/stable/c/65e344925fa30abf50c8de8c150b397715fa2066
• https://git.kernel.org/stable/c/6da717ed8a0703a331295fdd5ad8b7eacec216ad
• https://git.kernel.org/stable/c/e79389115b9d27287ff6230a9750675106ed7668
• https://git.kernel.org/stable/c/f88e12c95fc19f719e06ca1e9eb20fdad68ef61a

Get alerted when CVE-2026-74397 or the next vulnerability affects your stack