CVE-2026-46288 (GCVE-0-2026-46288)
Vulnerability from cvelistv5 – Published: 2026-06-08 15:41 – Updated: 2026-08-05 12:31
VLAI
EPSS
VEX
Title
of: unittest: fix use-after-free in of_unittest_changeset()
Summary
In the Linux kernel, the following vulnerability has been resolved:
of: unittest: fix use-after-free in of_unittest_changeset()
The variable 'parent' is assigned the value of 'nchangeset' earlier in the
function, meaning both point to the same struct device_node. The call to
of_node_put(nchangeset) can decrement the reference count to zero and
free the node if there are no other holders. After that, the code still
uses 'parent' to check for the presence of a property and to read a
string property, leading to a use-after-free.
Fix this by moving the of_node_put() call after the last access to
'parent', avoiding the UAF.
Severity
8.4 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1c668ea65506e67ce2eae07b69bb09fcdd86e309 , < 37318d1a27c9cc5a70d3cd7e49e30ec86f2b8ca1
(git)
Affected: 1c668ea65506e67ce2eae07b69bb09fcdd86e309 , < 7f0f0926f3010b10cff5e93446258f971e42f2fd (git) Affected: 1c668ea65506e67ce2eae07b69bb09fcdd86e309 , < 6fdad20b7975bdc32e85b45f8f7c640f6687b81f (git) Affected: 1c668ea65506e67ce2eae07b69bb09fcdd86e309 , < faecdd423c27f0d6090156a435ba9dbbac0eaddb (git) |
guessed | |
| Linux | Linux |
Affected:
6.12
Unaffected: 0 , < 6.12 (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) |
guessed |
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}
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"value": "AV:L - The vulnerable code runs only during late_initcall boot self-tests in drivers/of/unittest.c; reaching it requires local ability to build and boot a kernel with CONFIG_OF_UNITTEST enabled, with no network, syscall, or ioctl runtime path.\nAC:L - Once the unittest kernel boots, the UAF triggers deterministically after of_changeset_revert() when of_node_put() drops the sole reference; no race or attacker-uncontrolled memory layout is required.\nPR:N - Exploitation does not require privileges on a running production system\u2014only booting a specially built unittest kernel\u2014so no authenticated local user or namespace capability on the target image is needed.\nUI:N - The unittest executes automatically during kernel initialization after testcase DT data is attached; no additional victim interaction beyond booting the test configuration is required.\nS:U - The UAF corrupts kernel heap memory during in-kernel device-tree self-tests and does not cross VM, sandbox, or IOMMU security boundaries.\nC:H - After of_node_put() frees the device_node, of_property_present() and of_property_read_string() dereference freed memory, enabling kernel information disclosure from attacker-influencable freed heap contents.\nI:H - Use-after-free on a struct device_node in kernel heap can be leveraged for memory corruption and arbitrary kernel code execution via heap grooming, not merely a bounded write.\nA:H - Dereferencing a freed device_node during property lookups can cause kernel oops, BUG, or panic during boot-time unittest execution."
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"title": "of: unittest: fix use-after-free in of_unittest_changeset()",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nof: unittest: fix use-after-free in of_unittest_changeset()\n\nThe variable \u0027parent\u0027 is assigned the value of \u0027nchangeset\u0027 earlier in the\nfunction, meaning both point to the same struct device_node. The call to\nof_node_put(nchangeset) can decrement the reference count to zero and\nfree the node if there are no other holders. After that, the code still\nuses \u0027parent\u0027 to check for the presence of a property and to read a\nstring property, leading to a use-after-free.\n\nFix this by moving the of_node_put() call after the last access to\n\u0027parent\u0027, avoiding the UAF."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nof: unittest: corregir uso despu\u00e9s de liberaci\u00f3n en of_unittest_changeset()\n\nLa variable \u0027parent\u0027 se le asigna el valor de \u0027nchangeset\u0027 anteriormente en la funci\u00f3n, lo que significa que ambos apuntan a la misma estructura device_node. La llamada a of_node_put(nchangeset) puede decrementar el contador de referencias a cero y liberar el nodo si no hay otros poseedores. Despu\u00e9s de eso, el c\u00f3digo todav\u00eda usa \u0027parent\u0027 para verificar la presencia de una propiedad y para leer una propiedad de cadena, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n.\n\nSolucione esto moviendo la llamada a of_node_put() despu\u00e9s del \u00faltimo acceso a \u0027parent\u0027, evitando el UAF."
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"published": "2026-06-08T17:16:46.957",
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"cve": "CVE-2026-46288",
"id": "CVE-2026-46288",
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"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: of: unittest: fix use-after-free in of_unittest_changeset()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46288.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:10:17Z",
"cve": "CVE-2026-46288",
"id": "CVE-2026-46288",
"initial_release_date": "2026-06-09T02:21:01Z",
"product_status:known_affected": "17",
"product_status:known_not_affected": "370",
"product_status:recommended": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46288",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46288.json",
"version": "6"
}
}
}
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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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