CVE-2026-98430

What it actually does

Race condition in RDMA/efa driver where IRQ handler can access admin completion and async event queues before they are fully initialized or after they have been destroyed, due to mismatched lifetimes between IRQ registration and queue construction/destruction.

Why it matters to the business

Potential system crashes or memory corruption on systems using EFA RDMA hardware during driver load/unload, leading to downtime or instability in high-performance networking environments.

How an attack unfolds

An attacker with local access times IRQ registration and queue initialization or teardown sequences to trigger the handler when resources are invalid, potentially causing denial of service or memory corruption; no known remote or in-the-wild exploitation.

How to fix it

Update to a Linux kernel version containing the fix that initializes queues with interrupts masked, registers the IRQ, then enables interrupt mode, and ensures device reset and IRQ free occur before queue destruction on removal or failure.

How to confirm the fix worked

Verify kernel source or binary contains the updated RDMA/efa initialization sequence with masked interrupts and proper teardown ordering; test driver load/unload under IRQ stress to confirm no handler access to uninitialized queues.

Typical attack path

1. Gain local access to a system with EFA RDMA hardware and the vulnerable driver
2. Trigger repeated module load/unload or device reset operations
3. Race the IRQ handler against queue construction or destruction
4. Cause invalid memory access leading to crash or corruption

How to detect it

Review kernel logs for RDMA/efa related oops, null pointer dereferences, or use-after-free during module init or removal; no specific post-exploitation artifacts known.

What your security team should do

• Prioritize kernel updates on systems with EFA hardware within standard patching windows given low exploitability indicators
• Monitor for upstream stable kernel releases containing the described fix
• Restrict unprivileged module loading where feasible until patched