265 lines
16 KiB
JSON
265 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-46325",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.112Z",
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"datePublished": "2026-06-09T12:25:52.792Z",
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"dateUpdated": "2026-10-21T12:41:37.480Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-10-21T12:41:37.480Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE\n\nThe current implementation incorrectly handles memory regions (MRs) with\npage sizes different from the system PAGE_SIZE. The core issue is that\nrxe_set_page() is called with mr->page_size step increments, but the\npage_list stores individual struct page pointers, each representing\nPAGE_SIZE of memory.\n\nib_sg_to_page() has ensured that when i>=1 either\na) SG[i-1].dma_end and SG[i].dma_addr are contiguous\nor\nb) SG[i-1].dma_end and SG[i].dma_addr are mr->page_size aligned.\n\nThis leads to incorrect iova-to-va conversion in scenarios:\n\n1) page_size < PAGE_SIZE (e.g., MR: 4K, system: 64K):\n ibmr->iova = 0x181800\n sg[0]: dma_addr=0x181800, len=0x800\n sg[1]: dma_addr=0x173000, len=0x1000\n\n Access iova = 0x181800 + 0x810 = 0x182010\n Expected VA: 0x173010 (second SG, offset 0x10)\n Before fix:\n - index = (0x182010 >> 12) - (0x181800 >> 12) = 1\n - page_offset = 0x182010 & 0xFFF = 0x10\n - xarray[1] stores system page base 0x170000\n - Resulting VA: 0x170000 + 0x10 = 0x170010 (wrong)\n\n2) page_size > PAGE_SIZE (e.g., MR: 64K, system: 4K):\n ibmr->iova = 0x18f800\n sg[0]: dma_addr=0x18f800, len=0x800\n sg[1]: dma_addr=0x170000, len=0x1000\n\n Access iova = 0x18f800 + 0x810 = 0x190010\n Expected VA: 0x170010 (second SG, offset 0x10)\n Before fix:\n - index = (0x190010 >> 16) - (0x18f800 >> 16) = 1\n - page_offset = 0x190010 & 0xFFFF = 0x10\n - xarray[1] stores system page for dma_addr 0x170000\n - Resulting VA: system page of 0x170000 + 0x10 = 0x170010 (wrong)\n\nYi Zhang reported a kernel panic[1] years ago related to this defect.\n\nSolution:\n1. Replace xarray with pre-allocated rxe_mr_page array for sequential\n indexing (all MR page indices are contiguous)\n2. Each rxe_mr_page stores both struct page* and offset within the\n system page\n3. Handle MR page_size != PAGE_SIZE relationships:\n - page_size > PAGE_SIZE: Split MR pages into multiple system pages\n - page_size <= PAGE_SIZE: Store offset within system page\n4. Add boundary checks and compatibility validation\n\nThis ensures correct iova-to-va conversion regardless of MR page size\nand system PAGE_SIZE relationship, while improving performance through\narray-based sequential access.\n\nTests on 4K and 64K PAGE_SIZE hosts:\n- rdma-core/pytests\n $ ./build/bin/run_tests.py --dev eth0_rxe\n- blktest:\n $ TIMEOUT=30 QUICK_RUN=1 USE_RXE=1 NVMET_TRTYPES=rdma ./check nvme srp rnbd\n\n[1] https://lore.kernel.org/all/CAHj4cs9XRqE25jyVw9rj9YugffLn5+f=1znaBEnu1usLOciD+g@mail.gmail.com/T/"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The bug is reached when rxe processes incoming RoCE packets over UDP (port 4791) on the responder path for RDMA Read, Write, and Atomic operations, which is the standard network-facing deployment for software RoCE storage targets and RDMA services.\nAC:L - Once a victim host runs rxe with an FMR whose page_size differs from PAGE_SIZE, a remote peer can reliably trigger the defective iova-to-VA conversion by sending RDMA operations with IOVAs that cross MR page boundaries, as demonstrated in the fix commit's worked examples.\nPR:N - Exploitation requires no OS privileges on the victim host; a remote attacker only needs network reachability to an established RDMA session (e.g., NVMe-oF or rtrs client) and a valid rkey from that connection, not local root or CAP_NET_ADMIN on the target system.\nUI:N - No victim user action is required beyond normal operation of an RDMA-connected service; the attacker triggers the flaw by sending crafted RDMA packets over an existing queue pair.\nS:U - Impact is confined to kernel memory corruption and crashes within the same kernel security boundary; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Incorrect iova-to-VA mapping causes memcpy and atomic handlers to read from the wrong struct page, enabling disclosure of data from unintended pages within the MR mapping and constituting out-of-bounds kernel memory read.\nI:H - RDMA Write and Atomic Write operations using the buggy conversion write to incorrectly resolved virtual addresses, corrupting kernel memory outside the intended MR buffer and providing a memory-corruption primitive exploitable for further compromise.\nA:H - The fix commit cites a confirmed kernel panic from this defect, and misresolved page mappings in rxe_mr_copy() can cause oopses or crashes when accessing invalid or misaligned memory."
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}
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/infiniband/sw/rxe/rxe_mr.c",
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"drivers/infiniband/sw/rxe/rxe_verbs.h"
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"drivers/infiniband/sw/rxe/rxe_mr.c",
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"drivers/infiniband/sw/rxe/rxe_verbs.h"
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}
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"title": "RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE",
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"id": "CVE-2026-46325",
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"role": "CISA Coordinator",
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"options": [
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"description": "CWE-190 Integer Overflow or Wraparound"
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}
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]
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}
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