CVE-2026-46022 (GCVE-0-2026-46022)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-06-14 17:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt() ibmasm_handle_mouse_interrupt() performs an out-of-bounds MMIO read when the queue reader or writer index from hardware exceeds REMOTE_QUEUE_SIZE (60). A compromised service processor can trigger this by writing an out-of-range value to the reader or writer MMIO register before asserting an interrupt. Since writer is re-read from hardware on every loop iteration, it can also be set to an out-of-range value after the loop has already started. The root cause is that get_queue_reader() and get_queue_writer() return raw readl() values that are passed directly into get_queue_entry(), which computes: queue_begin + reader * sizeof(struct remote_input) with no bounds check. This unchecked MMIO address is then passed to memcpy_fromio(), reading 8 bytes from unintended device registers. For sufficiently large values the address falls outside the PCI BAR mapping entirely, triggering a machine check exception. Fix by checking both indices against REMOTE_QUEUE_SIZE at the top of the loop body, before any call to get_queue_entry(). On an out-of-range value, reset the reader register to 0 via set_queue_reader() before breaking, so that normal queue operation can resume if the corrupted hardware state is transient.
Impacted products
Vendor Product Version
Linux Linux Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
Version: 278d72ae8803ffcd16070c95fe1d53f4466dc741
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/ibmasm/remote.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
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              "version": "5.10.258",
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              "status": "unaffected",
              "version": "5.15.209",
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
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              "status": "unaffected",
              "version": "6.18.27",
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              "version": "7.0.4",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()\n\nibmasm_handle_mouse_interrupt() performs an out-of-bounds MMIO read\nwhen the queue reader or writer index from hardware exceeds\nREMOTE_QUEUE_SIZE (60).\n\nA compromised service processor can trigger this by writing an\nout-of-range value to the reader or writer MMIO register before\nasserting an interrupt. Since writer is re-read from hardware on\nevery loop iteration, it can also be set to an out-of-range value\nafter the loop has already started.\n\nThe root cause is that get_queue_reader() and get_queue_writer() return\nraw readl() values that are passed directly into get_queue_entry(),\nwhich computes:\n\n  queue_begin + reader * sizeof(struct remote_input)\n\nwith no bounds check. This unchecked MMIO address is then passed to\nmemcpy_fromio(), reading 8 bytes from unintended device registers.\nFor sufficiently large values the address falls outside the PCI BAR\nmapping entirely, triggering a machine check exception.\n\nFix by checking both indices against REMOTE_QUEUE_SIZE at the top of\nthe loop body, before any call to get_queue_entry(). On an out-of-range\nvalue, reset the reader register to 0 via set_queue_reader() before\nbreaking, so that normal queue operation can resume if the corrupted\nhardware state is transient."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:48:35.855Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6f6ecc9153df176e956d0664b56f93080b0a45f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/bac8643486f854dd53af9b23aea7dbbd9b7c1865"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc7e9a74e32299d7e93e178ca482a0b59ef1595b"
        },
        {
          "url": "https://git.kernel.org/stable/c/07c4f18b303106e6b24492c12b95d48a4b985841"
        },
        {
          "url": "https://git.kernel.org/stable/c/22a16d3eafee92a165c756081587c95850127107"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ca75f6b74ec7f685464e5745ecfcf3a76d284e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b6e6ead556734bdc14024c5f837132b1e7a4b84"
        }
      ],
      "title": "misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46022",
    "datePublished": "2026-05-27T12:56:26.791Z",
    "dateReserved": "2026-05-13T15:03:33.092Z",
    "dateUpdated": "2026-06-14T17:48:35.855Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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