CVE-2021-47652 (GCVE-0-2021-47652)
Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-11 13:58
VLAI
EPSS
VEX
Title
video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()
Summary
In the Linux kernel, the following vulnerability has been resolved:
video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()
I got a null-ptr-deref report:
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
RIP: 0010:fb_destroy_modelist+0x38/0x100
...
Call Trace:
ufx_usb_probe.cold+0x2b5/0xac1 [smscufx]
usb_probe_interface+0x1aa/0x3c0 [usbcore]
really_probe+0x167/0x460
...
ret_from_fork+0x1f/0x30
If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will
be called to destroy modelist in the error handling path. But modelist
has not been initialized yet, so it will result in null-ptr-deref.
Initialize modelist before calling fb_alloc_cmap() to fix this bug.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:50 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < d1b6a1f0c23b7164250479bf92e2893291dca539
(git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 0fd28daec73525382e5c992db8743bf76e42cd5c (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4b (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < da8b269cc0a2526ebeaccbe2484c999eb0f822cf (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 64ec3e678d76419f207b9cdd338dda438ca10b1c (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < c420b540db4b5d69de0a36d8b9d9a6a79a04f05a (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < d396c651e2b508b6179bb678cc029f3becbf5170 (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 9280ef235b05e8f19f8bc6d547b992f0a0ef398d (git) Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 1791f487f877a9e83d81c8677bd3e7b259e7cb27 (git) |
guessed | |
| Linux | Linux |
Affected:
3.2
Unaffected: 0 , < 3.2 (semver) Unaffected: 4.9.311 , ≤ 4.9.* (semver) Unaffected: 4.14.276 , ≤ 4.14.* (semver) Unaffected: 4.19.238 , ≤ 4.19.* (semver) Unaffected: 5.4.189 , ≤ 5.4.* (semver) Unaffected: 5.10.110 , ≤ 5.10.* (semver) Unaffected: 5.15.33 , ≤ 5.15.* (semver) Unaffected: 5.16.19 , ≤ 5.16.* (semver) Unaffected: 5.17.2 , ≤ 5.17.* (semver) Unaffected: 5.18 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: smscufx: Corregir null-ptr-deref en ufx_usb_probe() Recib\u00ed un informe de null-ptr-deref: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000000 ... RIP: 0010:fb_destroy_modelist+0x38/0x100 ... Seguimiento de llamadas: ufx_usb_probe.cold+0x2b5/0xac1 [smscufx] usb_probe_interface+0x1aa/0x3c0 [usbcore] really_probe+0x167/0x460 ... ret_from_fork+0x1f/0x30 Si fb_alloc_cmap() falla en ufx_usb_probe(), fb_destroy_modelist() Se llamar\u00e1 a modelist para destruirlo en la ruta de manejo de errores. Pero modelist a\u00fan no se ha inicializado, por lo que dar\u00e1 como resultado null-ptr-deref. Inicialice modelist antes de llamar a fb_alloc_cmap() para corregir este error."
}
],
"id": "CVE-2021-47652",
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],
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{
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"value": "CWE-476"
}
],
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{
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"value": "CWE-476"
}
],
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"type": "Secondary"
}
]
}
},
"redhat_vex": {
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"current_release_date": "2026-06-29T22:47:36+00:00",
"cve": "CVE-2021-47652",
"id": "CVE-2021-47652",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47652.json",
"version": "3"
},
"vulnrichment": {
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],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"programFiles": [
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],
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()\n\nI got a null-ptr-deref report:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nRIP: 0010:fb_destroy_modelist+0x38/0x100\n...\nCall Trace:\n ufx_usb_probe.cold+0x2b5/0xac1 [smscufx]\n usb_probe_interface+0x1aa/0x3c0 [usbcore]\n really_probe+0x167/0x460\n...\n ret_from_fork+0x1f/0x30\n\nIf fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will\nbe called to destroy modelist in the error handling path. But modelist\nhas not been initialized yet, so it will result in null-ptr-deref.\n\nInitialize modelist before calling fb_alloc_cmap() to fix this bug."
}
],
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}
],
"title": "video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()",
"x_generator": {
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}
},
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"datePublished": "2025-02-26T01:54:18.089Z",
"dateReserved": "2025-02-26T01:48:21.520Z",
"dateUpdated": "2025-10-01T19:57:07.382Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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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
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- 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.
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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.