CVE-2026-31644

01/תיאור (מקור, אנגלית)

In the Linux kernel, the following vulnerability has been resolved: net: lan966x: fix use-after-free and leak in lan966x_fdma_reload() When lan966x_fdma_reload() fails to allocate new RX buffers, the restore path restarts DMA using old descriptors whose pages were already freed via lan966x_fdma_rx_free_pages(). Since page_pool_put_full_page() can release pages back to the buddy allocator, the hardware may DMA into memory now owned by other kernel subsystems. Additionally, on the restore path, the newly created page pool (if allocation partially succeeded) is overwritten without being destroyed, leaking it. Fix both issues by deferring the release of old pages until after the new allocation succeeds. Save the old page array before the allocation so old pages can be freed on the success path. On the failure path, the old descriptors, pages and page pool are all still valid, making the restore safe. Also ensure the restore path re-enables NAPI and wakes the netdev, matching the success path.

02/מוצרים מושפעים

linux: linux kernel

03/קישורים4

• git.kernel.org/stable/c/59c3d55a946cacdb4181600723c20ac4f4c20c84 Patch
• git.kernel.org/stable/c/691082c0b93c13a5e068c0905f673060bddc204e Patch
• git.kernel.org/stable/c/92a673019943770930e2a8bfd52e1aad47a1fc1f Patch
• git.kernel.org/stable/c/9950e9199b3dfdfbde0b8d96ba947d7b11243801 Patch