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CVE-2026-23236 (GCVE-0-2026-23236)

Vulnerability from cvelistv5 – Published: 2026-03-04 14:36 – Updated: 2026-08-05 12:20
VLAI
Title
fbdev: smscufx: properly copy ioctl memory to kernelspace
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: smscufx: properly copy ioctl memory to kernelspace The UFX_IOCTL_REPORT_DAMAGE ioctl does not properly copy data from userspace to kernelspace, and instead directly references the memory, which can cause problems if invalid data is passed from userspace. Fix this all up by correctly copying the memory before accessing it within the kernel.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 061cfeb560aa3ddc174153dbe5be9d0b55eb7248 (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 6167af934f956d3ae1e06d61f45cd0d1004bbe1a (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < a0321e6e58facb39fe191caa0e52ed9aab6a48fe (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 0634e8d650993602fc5b389ff7ac525f6542e141 (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 52917e265aa5f848212f60fc50fc504d8ef12866 (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 1c008ad0f0d1c1523902b9cdb08e404129677bfc (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < f1e91bd4efeae48b0f42caed7e8ce2e3a0d05b02 (git)
Affected: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 , < 120adae7b42faa641179270c067864544a50ab69 (git)
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Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.251 , ≤ 5.10.* (semver)
Unaffected: 5.15.201 , ≤ 5.15.* (semver)
Unaffected: 6.1.164 , ≤ 6.1.* (semver)
Unaffected: 6.6.127 , ≤ 6.6.* (semver)
Unaffected: 6.12.74 , ≤ 6.12.* (semver)
Unaffected: 6.18.13 , ≤ 6.18.* (semver)
Unaffected: 6.19.3 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
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Fix\\nthis all up by correctly copying the memory before accessing it within\\nthe kernel.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nfbdev: smscufx: copiar correctamente la memoria ioctl al espacio del kernel\\n\\nEl ioctl UFX_IOCTL_REPORT_DAMAGE no copia correctamente los datos desde el espacio de usuario al espacio del kernel, y en su lugar referencia directamente la memoria, lo que puede causar problemas si se pasan datos inv\u00e1lidos desde el espacio de usuario. Soluciona todo esto copiando correctamente la memoria antes de acceder a ella dentro del kernel.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/video/fbdev/smscufx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"061cfeb560aa3ddc174153dbe5be9d0b55eb7248\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"6167af934f956d3ae1e06d61f45cd0d1004bbe1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"a0321e6e58facb39fe191caa0e52ed9aab6a48fe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"0634e8d650993602fc5b389ff7ac525f6542e141\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"52917e265aa5f848212f60fc50fc504d8ef12866\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"1c008ad0f0d1c1523902b9cdb08e404129677bfc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"f1e91bd4efeae48b0f42caed7e8ce2e3a0d05b02\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c8a63e22a0802fd56380f6ab305b419f18eb6f5\",\"lessThan\":\"120adae7b42faa641179270c067864544a50ab69\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/video/fbdev/smscufx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.251\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.201\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.164\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.127\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.74\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.13\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.3\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"RUGGEDCOM RST2428P\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V4.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.5},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.2\",\"versionEndExcluding\":\"5.10.251\",\"matchCriteriaId\":\"C8DBBBFC-9692-4C23-A5E0-8F01CB6789D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.201\",\"matchCriteriaId\":\"600A89ED-86F2-48D8-BB7C-5EE7A8832FC5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.164\",\"matchCriteriaId\":\"6892F74B-3F14-4500-9652-24A2ECB04144\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.127\",\"matchCriteriaId\":\"4A9F36A3-A685-48A0-84B4-6217052BD058\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.74\",\"matchCriteriaId\":\"C2968F55-D03F-42BE-A694-F0A37BC8CBE3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.13\",\"matchCriteriaId\":\"6BDEF9FB-423E-49F6-991B-9277CC3AF400\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.3\",\"matchCriteriaId\":\"7853A337-FB2A-4E19-AB47-4E38343532AA\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/061cfeb560aa3ddc174153dbe5be9d0b55eb7248\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0634e8d650993602fc5b389ff7ac525f6542e141\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/120adae7b42faa641179270c067864544a50ab69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1c008ad0f0d1c1523902b9cdb08e404129677bfc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/52917e265aa5f848212f60fc50fc504d8ef12866\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6167af934f956d3ae1e06d61f45cd0d1004bbe1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a0321e6e58facb39fe191caa0e52ed9aab6a48fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f1e91bd4efeae48b0f42caed7e8ce2e3a0d05b02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T17:53:28+00:00",
      "cve": "CVE-2026-23236",
      "id": "CVE-2026-23236",
      "initial_release_date": "2026-03-04T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel `smscufx` driver: Denial of service via improper ioctl input handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23236.json",
      "version": "3"
    }
  }
}



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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.


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.