CVE-2025-22086 (GCVE-0-2025-22086)
Vulnerability from cvelistv5
Published
2025-04-16 14:12
Modified
2026-08-05 11:56
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix mlx5_poll_one() cur_qp update flow When cur_qp isn't NULL, in order to avoid fetching the QP from the radix tree again we check if the next cqe QP is identical to the one we already have. The bug however is that we are checking if the QP is identical by checking the QP number inside the CQE against the QP number inside the mlx5_ib_qp, but that's wrong since the QP number from the CQE is from FW so it should be matched against mlx5_core_qp which is our FW QP number. Otherwise we could use the wrong QP when handling a CQE which could cause the kernel trace below. This issue is mainly noticeable over QPs 0 & 1, since for now they are the only QPs in our driver whereas the QP number inside mlx5_ib_qp doesn't match the QP number inside mlx5_core_qp. BUG: kernel NULL pointer dereference, address: 0000000000000012 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP CPU: 0 UID: 0 PID: 7927 Comm: kworker/u62:1 Not tainted 6.14.0-rc3+ #189 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core] RIP: 0010:mlx5_ib_poll_cq+0x4c7/0xd90 [mlx5_ib] Code: 03 00 00 8d 58 ff 21 cb 66 39 d3 74 39 48 c7 c7 3c 89 6e a0 0f b7 db e8 b7 d2 b3 e0 49 8b 86 60 03 00 00 48 c7 c7 4a 89 6e a0 <0f> b7 5c 98 02 e8 9f d2 b3 e0 41 0f b7 86 78 03 00 00 83 e8 01 21 RSP: 0018:ffff88810511bd60 EFLAGS: 00010046 RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88885fa1b3c0 RDI: ffffffffa06e894a RBP: 00000000000000b0 R08: 0000000000000000 R09: ffff88810511bc10 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88810d593000 R13: ffff88810e579108 R14: ffff888105146000 R15: 00000000000000b0 FS: 0000000000000000(0000) GS:ffff88885fa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000012 CR3: 00000001077e6001 CR4: 0000000000370eb0 Call Trace: <TASK> ? __die+0x20/0x60 ? page_fault_oops+0x150/0x3e0 ? exc_page_fault+0x74/0x130 ? asm_exc_page_fault+0x22/0x30 ? mlx5_ib_poll_cq+0x4c7/0xd90 [mlx5_ib] __ib_process_cq+0x5a/0x150 [ib_core] ib_cq_poll_work+0x31/0x90 [ib_core] process_one_work+0x169/0x320 worker_thread+0x288/0x3a0 ? work_busy+0xb0/0xb0 kthread+0xd7/0x1f0 ? kthreads_online_cpu+0x130/0x130 ? kthreads_online_cpu+0x130/0x130 ret_from_fork+0x2d/0x50 ? kthreads_online_cpu+0x130/0x130 ret_from_fork_asm+0x11/0x20 </TASK>
References
Impacted products
Vendor Product Version
Linux Linux Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix mlx5_poll_one() cur_qp update flow\n\nWhen cur_qp isn\u0027t NULL, in order to avoid fetching the QP from\nthe radix tree again we check if the next cqe QP is identical to\nthe one we already have.\n\nThe bug however is that we are checking if the QP is identical by\nchecking the QP number inside the CQE against the QP number inside the\nmlx5_ib_qp, but that\u0027s wrong since the QP number from the CQE is from\nFW so it should be matched against mlx5_core_qp which is our FW QP\nnumber.\n\nOtherwise we could use the wrong QP when handling a CQE which could\ncause the kernel trace below.\n\nThis issue is mainly noticeable over QPs 0 \u0026 1, since for now they are\nthe only QPs in our driver whereas the QP number inside mlx5_ib_qp\ndoesn\u0027t match the QP number inside mlx5_core_qp.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000012\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP\n CPU: 0 UID: 0 PID: 7927 Comm: kworker/u62:1 Not tainted 6.14.0-rc3+ #189\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core]\n RIP: 0010:mlx5_ib_poll_cq+0x4c7/0xd90 [mlx5_ib]\n Code: 03 00 00 8d 58 ff 21 cb 66 39 d3 74 39 48 c7 c7 3c 89 6e a0 0f b7 db e8 b7 d2 b3 e0 49 8b 86 60 03 00 00 48 c7 c7 4a 89 6e a0 \u003c0f\u003e b7 5c 98 02 e8 9f d2 b3 e0 41 0f b7 86 78 03 00 00 83 e8 01 21\n RSP: 0018:ffff88810511bd60 EFLAGS: 00010046\n RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: ffff88885fa1b3c0 RDI: ffffffffa06e894a\n RBP: 00000000000000b0 R08: 0000000000000000 R09: ffff88810511bc10\n R10: 0000000000000001 R11: 0000000000000001 R12: ffff88810d593000\n R13: ffff88810e579108 R14: ffff888105146000 R15: 00000000000000b0\n FS:  0000000000000000(0000) GS:ffff88885fa00000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000012 CR3: 00000001077e6001 CR4: 0000000000370eb0\n Call Trace:\n  \u003cTASK\u003e\n  ? __die+0x20/0x60\n  ? page_fault_oops+0x150/0x3e0\n  ? exc_page_fault+0x74/0x130\n  ? asm_exc_page_fault+0x22/0x30\n  ? mlx5_ib_poll_cq+0x4c7/0xd90 [mlx5_ib]\n  __ib_process_cq+0x5a/0x150 [ib_core]\n  ib_cq_poll_work+0x31/0x90 [ib_core]\n  process_one_work+0x169/0x320\n  worker_thread+0x288/0x3a0\n  ? work_busy+0xb0/0xb0\n  kthread+0xd7/0x1f0\n  ? kthreads_online_cpu+0x130/0x130\n  ? kthreads_online_cpu+0x130/0x130\n  ret_from_fork+0x2d/0x50\n  ? kthreads_online_cpu+0x130/0x130\n  ret_from_fork_asm+0x11/0x20\n  \u003c/TASK\u003e"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The mis-attributed completions are driven by MAD traffic on the ib_mad shared CQ, whose receive CQEs are generated by unsolicited SMP/GMP/CM MADs sent by any node on the InfiniBand subnet. This is a logically adjacent L2 fabric rather than a routable network, and the affected QP0+QP1-sharing-a-CQ configuration only exists on IB link-layer ports (not routable RoCE).\nAC:L - This is not a race \u2014 the mismatch is deterministic once a QP\u0027s firmware QPN collides with the fixed verbs numbers 0/1 used for SMI/GSI, and an attacker simply floods MADs to guarantee multi-QP batched polls of the shared MAD CQ. No memory layout or timing condition outside the attacker\u0027s influence must be met.\nPR:N - MAD reception on QP0/QP1 is completely unauthenticated \u2014 any node on the subnet can send MADs that land on the GSI/SMI receive queues and generate CQEs. The polling itself runs in an unbound kernel workqueue with no credential check.\nUI:N - The ib_mad port, its QP0/QP1 pair, and the shared CQ are created automatically when the mlx5 IB device is probed; no administrator or victim action is needed to arm or trigger the path.\nS:U - The wrong-QP handling, out-of-bounds accesses, and the resulting indirect call all occur within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Masking wqe_ctr with the wrong QP\u0027s wqe_cnt (zero for the HW GSI QP) yields out-of-bounds reads of wq-\u003ewrid[]/wq-\u003ewqe_head[] against a ZERO_SIZE_PTR base, and completions are delivered against the wrong QP, disclosing another QP\u0027s work-request cookies (kernel pointers) to the consuming ULP.\nI:H - The wrong QP\u0027s queue state (wq-\u003etail, sq.last_poll) is corrupted, and the out-of-bounds-read wr_id is consumed as a struct ib_cqe pointer by __ib_process_cq(), which performs wc-\u003ewr_cqe-\u003edone(cq, wc) \u2014 an indirect call through a heap-derived function pointer, followed by ib_mad list manipulation on the same bogus pointer, giving control-flow hijack and write primitives.\nA:H - The commit documents a reproducible kernel NULL/wild pointer dereference oops in mlx5_ib_poll_cq() from the MAD completion workqueue, and handle_atomics() can additionally spin in an unbounded loop over wild memory, hanging the CQ poll worker."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:56:39.977Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3b97d77049856865ac5ce8ffbc6e716928310f7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/856d9e5d72dc44eca6d5a153581c58fbd84e92e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0447ceb8a31d79bee7144f98f9a13f765531e1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc7139b7031d877acd73d7eff55670f22f48cd5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c51a6964b45b6d40027abd77e89cef30d26dc5a"
        },
        {
          "url": "https://git.kernel.org/stable/c/cad677085274ecf9c7565b5bfc5d2e49acbf174c"
        },
        {
          "url": "https://git.kernel.org/stable/c/55c65a64aefa6267b964d90e9a4039cb68ec73a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d52636eb13ccba448a752964cc6fc49970912874"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ed3b0cb3f827072e93b4c5b6e2b8106fd7cccbd"
        }
      ],
      "title": "RDMA/mlx5: Fix mlx5_poll_one() cur_qp update flow",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22086",
    "datePublished": "2025-04-16T14:12:34.560Z",
    "dateReserved": "2024-12-29T08:45:45.816Z",
    "dateUpdated": "2026-08-05T11:56:39.977Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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