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CVE-2026-98492: net: macb: fix dma_alloc_coherent() leak on macb_alloc() error paths

• 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 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: net: macb: fix dma_alloc_coherent() leak on macb_alloc() error paths Fix 3 leaks in macb_alloc() error paths: - Tx buffer allocated but crossing a 4G boundary: Tx leaked. - Rx buffer allocation fails: Tx leaked. - Rx buffer allocated but crossing a 4G boundary: Tx & Rx leaked. This is because our error handling calls macb_free(bp) which in turn frees the buffers stored in bp->queues[0], but nothing has been stored in there. Fix by storing allocated buffers into bp->queues[0] ASAP.

Affected products

• Linux kernel: from 6.17.3 before 6.18; 6.18 — fixed in 6.18, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.18, 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/23d42b9a3bcd55b17d3b371544fedc708c2397e9
• https://git.kernel.org/stable/c/259e6cbb6a097da8ced544ee92a6fbde35aa1338
• https://git.kernel.org/stable/c/bda487567d0b7b15dfa876511085c0666b9efad5

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