CVE-2026-46022 (GCVE-0-2026-46022)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-06-14 17:48
VLAI
Title
misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < 6f6ecc9153df176e956d0664b56f93080b0a45f0 (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < bac8643486f854dd53af9b23aea7dbbd9b7c1865 (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < fc7e9a74e32299d7e93e178ca482a0b59ef1595b (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < 07c4f18b303106e6b24492c12b95d48a4b985841 (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < 22a16d3eafee92a165c756081587c95850127107 (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 (git)
Affected: 278d72ae8803ffcd16070c95fe1d53f4466dc741 , < 4b6e6ead556734bdc14024c5f837132b1e7a4b84 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.13
Unaffected: 0 , < 2.6.13 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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."
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          "url": "https://git.kernel.org/stable/c/4b6e6ead556734bdc14024c5f837132b1e7a4b84"
        }
      ],
      "title": "misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()",
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    "dateReserved": "2026-05-13T15:03:33.092Z",
    "dateUpdated": "2026-06-14T17:48:35.855Z",
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      "title": "misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()",
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T06:45:32+00:00",
      "cve": "CVE-2026-46022",
      "id": "CVE-2026-46022",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46022.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-15T01:25:19Z",
      "cve": "CVE-2026-46022",
      "id": "CVE-2026-46022",
      "initial_release_date": "2026-05-28T03:54:13Z",
      "product_status:known_affected": "291",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46022",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46022.json",
      "version": "6"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.