RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE The current implementation incorrectly handles memory regions (MRs) with page sizes different from the system PAGE_SIZE. The core issue is that rxe_set_page() is called with mr->page_size step increments, but the page_list stores individual struct page pointers, each representing PAGE_SIZE of memory. ib_sg_to_page() has ensured that when i>=1 either a) SG[i-1].dma_end and SG[i].dma_addr are contiguous or b) SG[i-1].dma_end and SG[i].dma_addr are mr->page_size aligned. This leads to incorrect iova-to-va conversion in scenarios: 1) page_size < PAGE_SIZE (e.g., MR: 4K, system: 64K): ibmr->iova = 0x181800 sg[0]: dma_addr=0x181800, len=0x800 sg[1]: dma_addr=0x173000, len=0x1000 Access iova = 0x181800 + 0x810 = 0x182010 Expected VA: 0x173010 (second SG, offset 0x10) Before fix: • index = (0x182010 >> 12) - (0x181800 >> 12) = 1 • page_offset = 0x182010 & 0xFFF = 0x10 • xarray[1] stores system page base 0x170000 • Resulting VA: 0x170000 + 0x10 = 0x170010 (wrong) 2) page_size > PAGE_SIZE (e.g., MR: 64K, system: 4K): ibmr->iova = 0x18f800 sg[0]: dma_addr=0x18f800, len=0x800 sg[1]: dma_addr=0x170000, len=0x1000 Access iova = 0x18f800 + 0x810 = 0x190010 Expected VA: 0x170010 (second SG, offset 0x10) Before fix: • index = (0x190010 >> 16) - (0x18f800 >> 16) = 1 • page_offset = 0x190010 & 0xFFFF = 0x10 • xarray[1] stores system page for dma_addr 0x170000 • Resulting VA: system page of 0x170000 + 0x10 = 0x170010 (wrong) Yi Zhang reported a kernel panic[1] years ago related to this defect. Solution: 1. Replace xarray with pre-allocated rxe_mr_page array for sequential indexing (all MR page indices are contiguous) 2. Each rxe_mr_page stores both struct page* and offset within the system page 3. Handle MR page_size != PAGE_SIZE relationships: • page_size > PAGE_SIZE: Split MR pages into multiple system pages • page_size <= PAGE_SIZE: Store offset within system page 4. Add boundary checks and compatibility validation This ensures correct iova-to-va conversion regardless of MR page size and system PAGE_SIZE relationship, while improving performance through array-based sequential access. Tests on 4K and 64K PAGE_SIZE hosts: • rdma-core/pytests $ ./build/bin/run_tests.py --dev eth0_rxe • blktest: $ TIMEOUT=30 QUICK_RUN=1 USE_RXE=1 NVMET_TRTYPES=rdma ./check nvme srp rnbd [1] https://lore.kernel.org/all/CAHj4cs9XRqE25jyVw9rj9YugffLn5+f=1znaBEnu1usLOciD+g@mail.gmail.com/T/

Timeline

1. Jun 9, 2026, 12:25 PM UTCCVE published
2. Oct 16, 2026, 3:22 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: total

3. Oct 21, 2026, 12:41 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 592627ccbdff0ec6fff00fc761142a76db750dd4 · fixed in e327021bd73b134c18167e2cd2a52eb5597fcba6; From 592627ccbdff0ec6fff00fc761142a76db750dd4 · fixed in 2a585a08a43c568ed6e9f27a97fd3d95106b9e68; From 592627ccbdff0ec6fff00fc761142a76db750dd4 · fixed in 409c2c5508f3d30627bea576f8676de523cb906e; From 592627ccbdff0ec6fff00fc761142a76db750dd4 · fixed in 836f6c13c9674027793f720be3f15ecd2b90b6ca; From 592627ccbdff0ec6fff00fc761142a76db750dd4 · fixed in 12985e5915a0b8354796efadaaeb201eed115377; From 6.2.3 · fixed in 6.3

• Linux Linux

  6.3

• KernelLinux

  From 6.3.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.14; From 6.19.0 · fixed in 6.19.4

References 5