ACK: [SRU][N][PATCH 0/1] CVE-2026-46325

[Hui Wang]

Acked-by: Hui Wang <hui.wang at canonical.com>

On 6/24/26 16:37, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-46325
>
> [ Impact ]
>
> The RDMA/rxe driver incorrectly handles memory regions (MRs) whose page size
> differs from the system PAGE_SIZE. Because rxe_set_page() advances by
> mr->page_size increments while the page_list stores individual PAGE_SIZE struct
> page pointers, iova-to-va conversion produces an incorrect virtual address
> whenever the MR page size is smaller or larger than PAGE_SIZE. This can cause
> memory accesses to resolve to the wrong page, leading to data corruption or a
> kernel panic, and carries a CVSS score of 9.8.
>
> [ Fix ]
>
> noble: backported with AI-assisted adaptation
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in this change could break iova-to-va translation in the RDMA/rxe
> (soft RoCE) driver, resulting in incorrect memory region accesses, data
> corruption, or crashes for RDMA workloads. The reworked rxe_mr_page array
> indexing and boundary checks could also introduce issues on hosts with non-
> default PAGE_SIZE (such as 64K) if the page-size handling is incorrect.
>