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CVE-2026-98486: net: ena: fix MMIO read buffer leak on probe failure

• 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: 2026-10-18 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: net: ena: fix MMIO read buffer leak on probe failure ena_device_init() initializes the MMIO read mechanism with ena_com_mmio_reg_read_request_init(), which allocates a coherent DMA buffer for MMIO read responses. The normal removal path releases this buffer through ena_com_mmio_reg_read_request_destroy(). However, if ena_probe() fails after ena_device_init() succeeds, the error path destroys the admin resources and eventually frees ena_dev without destroying the MMIO read request, leaving the coherent DMA buffer allocated. Call ena_com_mmio_reg_read_request_destroy() in the probe error path before releasing the remaining device resources. This issue was found by manual code inspection.

Affected products

• Linux: 4.9 — fixed in 7.3

How to fix

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

References

• https://git.kernel.org/stable/c/0d31edc7ff1f7f265c11248819dfaf5a8274b209
• https://git.kernel.org/stable/c/30ff01b4c7e419bb70f40f01dcd7f6af680808b3
• https://git.kernel.org/stable/c/47785f9f638b064ce6e32e8e3b6f1ffd83849fc2
• https://git.kernel.org/stable/c/4b90112826439149dcee20e73d02f25ae0e2a9fb
• https://git.kernel.org/stable/c/7bd3e9a2d0c288e54f51df260d9433163f5fbc1e
• https://git.kernel.org/stable/c/9476b4468862927297c94c440863cd8ed1e7cc83
• https://git.kernel.org/stable/c/9de940a3c5731be5a544f6f366576cc4dc073f7c
• https://git.kernel.org/stable/c/a0f5fd7a285f44fa402242f26feddfe1d4a0fc6c

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