CVE-2026-92521 (GCVE-0-2026-92521)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-17 16:10
VLAI
EPSS
VEX
Title
ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root
Summary
In the Linux kernel, the following vulnerability has been resolved:
ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root
acpi_pci_root_add() assigns the freshly allocated root to
device->driver_data before dmar_device_add() and pci_acpi_scan_root().
Both failure paths reach the end: label where root is kfree()'d, but
only the pci_acpi_scan_root() path clears driver_data first.
When dmar_device_add() fails during a hot-add, root is freed while
device->driver_data still points at it. The ACPI core does not clear
driver_data on attach failure, so a later acpi_pci_find_root() call may
dereference this dangling pointer.
acpi_pci_root_remove() has the same problem: it frees root without
clearing device->driver_data, leaving a dangling pointer behind after
the root bridge is removed.
Move the NULL assignment to the shared end: label so every error path in
acpi_pci_root_add() clears driver_data before freeing root, and clear it
in acpi_pci_root_remove() as well, so the object is never left reachable
through driver_data after being freed.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 321bb0eb1486a0d575f02e24e3f4170e408c2f51
(git)
Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2 (git) Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < a285fa3780c768dcc51c76768707d099a2cc611d (git) Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 6aaf6dbf54fdfae096f3f90a79e9614e46579280 (git) Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 70cf773cca30a10b4964c24520a71279c974b899 (git) Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 3eee4c21931dc048ce63b86809f04e4e6f0dcad5 (git) Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217 (git) Affected: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 , < 8a742141f7ab84975aa758b775567ef4740ef0cf (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.28
Unaffected: 0 , < 2.6.28 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/acpi/pci_root.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
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"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
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"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
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"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "8a742141f7ab84975aa758b775567ef4740ef0cf",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/acpi/pci_root.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.28"
},
{
"lessThan": "2.6.28",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.270",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.188",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.157",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.110",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.52",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc1",
"versionStartIncluding": "2.6.28",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root\n\nacpi_pci_root_add() assigns the freshly allocated root to\ndevice-\u003edriver_data before dmar_device_add() and pci_acpi_scan_root().\nBoth failure paths reach the end: label where root is kfree()\u0027d, but\nonly the pci_acpi_scan_root() path clears driver_data first.\n\nWhen dmar_device_add() fails during a hot-add, root is freed while\ndevice-\u003edriver_data still points at it. The ACPI core does not clear\ndriver_data on attach failure, so a later acpi_pci_find_root() call may\ndereference this dangling pointer.\n\nacpi_pci_root_remove() has the same problem: it frees root without\nclearing device-\u003edriver_data, leaving a dangling pointer behind after\nthe root bridge is removed.\n\nMove the NULL assignment to the shared end: label so every error path in\nacpi_pci_root_add() clears driver_data before freeing root, and clear it\nin acpi_pci_root_remove() as well, so the object is never left reachable\nthrough driver_data after being freed."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-17T16:10:28.144Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51"
},
{
"url": "https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2"
},
{
"url": "https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d"
},
{
"url": "https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280"
},
{
"url": "https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899"
},
{
"url": "https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5"
},
{
"url": "https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217"
},
{
"url": "https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf"
}
],
"title": "ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-92521",
"datePublished": "2026-09-17T16:10:28.144Z",
"dateReserved": "2026-09-16T12:21:13.874Z",
"dateUpdated": "2026-09-17T16:10:28.144Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/acpi/pci_root.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "321bb0eb1486a0d575f02e24e3f4170e408c2f51",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "70cf773cca30a10b4964c24520a71279c974b899",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "3eee4c21931dc048ce63b86809f04e4e6f0dcad5",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
},
{
"lessThan": "8a742141f7ab84975aa758b775567ef4740ef0cf",
"status": "affected",
"version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/acpi/pci_root.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.28"
},
{
"lessThan": "2.6.28",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root\n\nacpi_pci_root_add() assigns the freshly allocated root to\ndevice-\u003edriver_data before dmar_device_add() and pci_acpi_scan_root().\nBoth failure paths reach the end: label where root is kfree()\u0027d, but\nonly the pci_acpi_scan_root() path clears driver_data first.\n\nWhen dmar_device_add() fails during a hot-add, root is freed while\ndevice-\u003edriver_data still points at it. The ACPI core does not clear\ndriver_data on attach failure, so a later acpi_pci_find_root() call may\ndereference this dangling pointer.\n\nacpi_pci_root_remove() has the same problem: it frees root without\nclearing device-\u003edriver_data, leaving a dangling pointer behind after\nthe root bridge is removed.\n\nMove the NULL assignment to the shared end: label so every error path in\nacpi_pci_root_add() clears driver_data before freeing root, and clear it\nin acpi_pci_root_remove() as well, so the object is never left reachable\nthrough driver_data after being freed."
}
],
"id": "CVE-2026-92521",
"lastModified": "2026-09-17T17:17:55.013",
"metrics": {},
"published": "2026-09-17T17:17:55.013",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-09-18T00:13:15Z",
"cve": "CVE-2026-92521",
"id": "CVE-2026-92521",
"initial_release_date": "2026-09-18T00:13:15Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-92521",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-92521.json",
"version": "2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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