What’s Vulnerable › Vulnerabilities

CVE-2026-93109: RDMA/mlx5: Drain RCU callbacks during module teardown

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Drain RCU callbacks during module teardown devx_free_subscription() can remain queued after the last DevX event file drops its module reference or an auxiliary driver detaches its devices. mlx5_ib can then unload before the callback runs. Registration error unwind has the same risk because driver registration can attach existing devices before failing. Wait after all drivers have stopped.

Affected products

• Linux kernel: 5.6 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2f946e7839f677fa14574b6babad14b37ae0bbbe
• https://git.kernel.org/stable/c/4664368b9bd9d5d79ebad24056b98c34b9fed20f
• https://git.kernel.org/stable/c/4be7810ba70291abb2f68cc6db0ae1b93ee9c76a
• https://git.kernel.org/stable/c/59d60e04afd012f07e996d2e34cb90a4ec6f5cff
• https://git.kernel.org/stable/c/7babc25d8dd5b7642920fbc0737cfd1469e7025b
• https://git.kernel.org/stable/c/ca428e597f12b278bf158356e34641e6386cfa82
• https://git.kernel.org/stable/c/e37cdd75f8d61c1123d324ae5667ac3da562290e

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