CVE-2026-64512 (GCVE-0-2026-64512)
Vulnerability from cvelistv5
Published
2026-07-25 08:52
Modified
2026-08-17 04:57
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ACPI: CPPC: Suppress UBSAN warning caused by field misuse
The definition of reg->access_width changes depending on the
reg->space_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses
access_width to indicate the PCC region, which can result in a UBSAN
if the value is greater than 4.
For example:
UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9
shift exponent 32 is too large for 32-bit type 'int'
CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)
Hardware name: To be filled by O.E.M.
Call trace:
...(trimming)
ubsan_epilogue+0x10/0x48
__ubsan_handle_shift_out_of_bounds+0xdc/0x1e0
cpc_write+0x4d0/0x670
cppc_set_perf+0x18c/0x490
cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]
... (trimming)
Lets fix this by validating the region type, as well as whether
access_width has a value. Then since we are returning bit_width
directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting
the size.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 4949affd5288b867cdf115f5b08d6166b2027f87 Version: 01fc53be672acae37e611c80cc0b4f3939584de3 Version: 1b890ae474d19800a6be1696df7fb4d9a41676e4 Version: 2f4a4d63a193be6fd530d180bb13c3592052904c Version: 2f4a4d63a193be6fd530d180bb13c3592052904c Version: 2f4a4d63a193be6fd530d180bb13c3592052904c Version: 2f4a4d63a193be6fd530d180bb13c3592052904c Version: 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1 Version: 5.15.154 ≤ Version: 6.1.90 ≤ Version: 6.6.30 ≤ Version: 6.8.9 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/acpi/cppc_acpi.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
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"versionType": "git"
},
{
"lessThan": "e904596ba6dd108534ffa15e3e46b2fe245145e2",
"status": "affected",
"version": "01fc53be672acae37e611c80cc0b4f3939584de3",
"versionType": "git"
},
{
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"status": "affected",
"version": "1b890ae474d19800a6be1696df7fb4d9a41676e4",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "semver"
},
{
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"status": "affected",
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"versionType": "semver"
},
{
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"status": "affected",
"version": "6.8.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/acpi/cppc_acpi.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.155",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.155",
"versionStartIncluding": "5.15.154",
"vulnerable": true
},
{
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"versionEndExcluding": "6.1.178",
"versionStartIncluding": "6.1.90",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.30",
"vulnerable": true
},
{
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"versionEndExcluding": "6.12.96",
"versionStartIncluding": "6.9",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.8.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: CPPC: Suppress UBSAN warning caused by field misuse\n\nThe definition of reg-\u003eaccess_width changes depending on the\nreg-\u003espace_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses\naccess_width to indicate the PCC region, which can result in a UBSAN\nif the value is greater than 4.\n\nFor example:\n\n UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9\n shift exponent 32 is too large for 32-bit type \u0027int\u0027\n CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)\n Hardware name: To be filled by O.E.M.\n Call trace:\n ...(trimming)\n ubsan_epilogue+0x10/0x48\n __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0\n cpc_write+0x4d0/0x670\n cppc_set_perf+0x18c/0x490\n cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]\n ... (trimming)\n\nLets fix this by validating the region type, as well as whether\naccess_width has a value. Then since we are returning bit_width\ndirectly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting\nthe size."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:57:03.207Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2"
},
{
"url": "https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2"
},
{
"url": "https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99"
},
{
"url": "https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c"
},
{
"url": "https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b"
},
{
"url": "https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9"
},
{
"url": "https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1"
}
],
"title": "ACPI: CPPC: Suppress UBSAN warning caused by field misuse",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64512",
"datePublished": "2026-07-25T08:52:04.423Z",
"dateReserved": "2026-07-19T15:36:31.793Z",
"dateUpdated": "2026-08-17T04:57:03.207Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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