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misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-46022

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46022

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "6f6ecc9153df176e956d0664b56f93080b0a45f0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "bac8643486f854dd53af9b23aea7dbbd9b7c1865",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "fc7e9a74e32299d7e93e178ca482a0b59ef1595b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "07c4f18b303106e6b24492c12b95d48a4b985841",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "22a16d3eafee92a165c756081587c95850127107",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "1ca75f6b74ec7f685464e5745ecfcf3a76d284e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
        "lessThan": "4b6e6ead556734bdc14024c5f837132b1e7a4b84",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/misc/ibmasm/remote.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/misc/ibmasm/remote.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46022

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28373 · Revision 1
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Publisher date
Read the original announcement

Revision history

  1. CVE-2026-46022 · Revision 1Source updated