CVE-2026-74397
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, in the mlx5_ib driver, mlx5_ib_alloc_transport_domain() leaked the allocated transport domain when mlx5_ib_enable_lb() returned an error. The fix adds deallocation of TD on error, explicit return 0 in the no-loopback-capability branch, and moves lb mutex initialization to mlx5_ib_stage_init_init().
Risk Assessment
The vulnerability leads to kernel memory leak, which over time can cause resource exhaustion and system crash.
Recommendation
Install the Linux kernel update containing the fix for CVE-2026-74397.
Original NVD description (English source)
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().