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CVE-2021-47652 (GCVE-0-2021-47652)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-11 13:58
VLAI
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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47652\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T06:37:06.973\",\"lastModified\":\"2026-06-17T04:18:15.043\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"lang\":\"es\",\"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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T00:19:09Z",
      "cve": "CVE-2021-47652",
      "id": "CVE-2021-47652",
      "initial_release_date": "2025-02-27T03:14:11Z",
      "product_status:known_affected": "334",
      "product_status:known_not_affected": "319",
      "product_status:recommended": "319",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47652",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47652.json",
      "version": "44"
    },
    "vulnrichment": {
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.311\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.276\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.238\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.189\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.110\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"3.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:15:33.844Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47652\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T19:57:07.382Z\", \"dateReserved\": \"2025-02-26T01:48:21.520Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:54:18.089Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.