FKIE_CVE-2026-46022
Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-06-17 10:52
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/misc/ibmasm/remote.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "6f6ecc9153df176e956d0664b56f93080b0a45f0",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "bac8643486f854dd53af9b23aea7dbbd9b7c1865",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "fc7e9a74e32299d7e93e178ca482a0b59ef1595b",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "07c4f18b303106e6b24492c12b95d48a4b985841",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "22a16d3eafee92a165c756081587c95850127107",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "1ca75f6b74ec7f685464e5745ecfcf3a76d284e9",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
},
{
"lessThan": "4b6e6ead556734bdc14024c5f837132b1e7a4b84",
"status": "affected",
"version": "278d72ae8803ffcd16070c95fe1d53f4466dc741",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/misc/ibmasm/remote.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.13"
},
{
"lessThan": "2.6.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.86",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
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},
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],
"negate": false,
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],
"cveTags": [],
"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."
}
],
"id": "CVE-2026-46022",
"lastModified": "2026-06-17T10:52:54.897",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2026-05-27T14:17:20.670",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/07c4f18b303106e6b24492c12b95d48a4b985841"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/fc7e9a74e32299d7e93e178ca482a0b59ef1595b"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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