CVE-2026-98492 PUBLISHED

net: macb: fix dma_alloc_coherent() leak on macb_alloc() error paths

Assigner: Linux
Reserved: 25.09.2026 Published: 18.10.2026 Updated: 18.10.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 78d901897b3cae06b38f54e48a2378cf9da21175 to bda487567d0b7b15dfa876511085c0666b9efad5 (excl.)
  • affected from 78d901897b3cae06b38f54e48a2378cf9da21175 to 259e6cbb6a097da8ced544ee92a6fbde35aa1338 (excl.)
  • affected from 78d901897b3cae06b38f54e48a2378cf9da21175 to 23d42b9a3bcd55b17d3b371544fedc708c2397e9 (excl.)
  • Version 982a4d9a2e12b693f684eff943043a607628d871 is affected
  • affected from 6.17.3 to 6.18 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.18 is affected
  • unaffected from 0 to 6.18 (excl.)
  • unaffected from 6.18.55 to 6.18.* (incl.)
  • unaffected from 7.2.9 to 7.2.* (incl.)
  • unaffected from 7.3-rc5 to * (incl.)

References