CVE-2025-68806 (GCVE-0-2025-68806)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-08-05 12:11
VLAI
Title
ksmbd: fix buffer validation by including null terminator size in EA length
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix buffer validation by including null terminator size in EA length The smb2_set_ea function, which handles Extended Attributes (EA), was performing buffer validation checks that incorrectly omitted the size of the null terminating character (+1 byte) for EA Name. This patch fixes the issue by explicitly adding '+ 1' to EaNameLength where the null terminator is expected to be present in the buffer, ensuring the validation accurately reflects the total required buffer size.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d070c4dd2a5bed4e9832eec5b6c029c7d14892ea , < cae52c592a07e1d3fa3338a5f064a374a5f26750 (git)
Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < a28a375a5439eb474e9f284509a407efb479c925 (git)
Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < d26af6d14da43ab92d07bc60437c62901dc522e6 (git)
Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < 6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4 (git)
Affected: 0ba5439d9afa2722e7728df56f272c89987540a4 , < 95d7a890e4b03e198836d49d699408fd1867cb55 (git)
Affected: bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c (git)
Affected: 1a13ecb96230e8b7b91967e292836f7b01ec8111 (git)
Affected: 404e7c01e16288b5e0171d1d8fd3328e806d0794 (git)
Affected: 6.1.52 , < 6.1.160 (semver)
Affected: 5.15.131 , < 5.16 (semver)
Affected: 6.4.15 , < 6.5 (semver)
Affected: 6.5.2 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding \u0027+ 1\u0027 to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
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              "value": "AV:N - The flaw is reachable by a remote SMB2/3 client through ksmbd\u0027s SMB2 SET_INFO handler over TCP, normally port 445.\nAC:L - The client directly controls the EA lengths and contents, so one deterministic malformed request triggers the over-read without a race or an external condition.\nPR:N - Ksmbd supports passwordless guest sessions on guest-writable shares, where a remote client can obtain FILE_WRITE_EA access. Under the required highest-severity reasonable deployment, no prior privileges are needed.\nUI:N - The attacker can send the necessary SET_INFO and QUERY_INFO requests without any victim action.\nS:U - The disclosure affects the ksmbd host kernel and does not cross a separate virtualization, sandbox, or IOMMU security authority.\nC:H - The malformed EA stores an uninitialized receive-buffer byte in a user xattr that the client can query. Repeated requests with heap grooming can slowly disclose kernel heap contents, warranting high confidentiality impact under conservative scoring.\nI:N - The flaw does not corrupt kernel memory or provide a kernel write primitive; it only changes a user xattr that the client is already authorized to set.\nA:N - The receive allocation includes an extra tail byte, so the faulty copy reads uninitialized in-allocation data rather than faulting; no crash, hang, or resource exhaustion results."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:11:38.392Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750"
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        },
        {
          "url": "https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"
        }
      ],
      "title": "ksmbd: fix buffer validation by including null terminator size in EA length",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68806",
    "datePublished": "2026-01-13T15:29:13.797Z",
    "dateReserved": "2025-12-24T10:30:51.045Z",
    "dateUpdated": "2026-08-05T12:11:38.392Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-68806",
      "date": "2026-08-05",
      "epss": "0.00373",
      "percentile": "0.29995"
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ksmbd: fix buffer validation by including null terminator size in EA length",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-68806.json",
      "version": "3"
    },
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validaci\u00f3n del b\u00fafer al incluir el tama\u00f1o del terminador nulo en la longitud de EA\\n\\nLa funci\u00f3n smb2_set_ea, que maneja los Atributos Extendidos (EA),\\nestaba realizando comprobaciones de validaci\u00f3n del b\u00fafer que omit\u00edan incorrectamente el tama\u00f1o\\ndel car\u00e1cter de terminaci\u00f3n nula (+1 byte) para el Nombre de EA.\\nEste parche corrige el problema al a\u00f1adir expl\u00edcitamente \u0027+ 1\u0027 a EaNameLength donde\\nse espera que el terminador nulo est\u00e9 presente en el b\u00fafer, asegurando\\nque la validaci\u00f3n refleje con precisi\u00f3n el tama\u00f1o total de b\u00fafer requerido.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d070c4dd2a5bed4e9832eec5b6c029c7d14892ea\",\"lessThan\":\"cae52c592a07e1d3fa3338a5f064a374a5f26750\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ba5439d9afa2722e7728df56f272c89987540a4\",\"lessThan\":\"a28a375a5439eb474e9f284509a407efb479c925\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ba5439d9afa2722e7728df56f272c89987540a4\",\"lessThan\":\"d26af6d14da43ab92d07bc60437c62901dc522e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ba5439d9afa2722e7728df56f272c89987540a4\",\"lessThan\":\"6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ba5439d9afa2722e7728df56f272c89987540a4\",\"lessThan\":\"95d7a890e4b03e198836d49d699408fd1867cb55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1a13ecb96230e8b7b91967e292836f7b01ec8111\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"404e7c01e16288b5e0171d1d8fd3328e806d0794\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.52\",\"lessThan\":\"6.1.160\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.131\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.4.15\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.5.2\",\"lessThan\":\"6.6\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.160\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.64\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.3\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:46:25+00:00",
      "cve": "CVE-2025-68806",
      "id": "CVE-2025-68806",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix buffer validation by including null terminator size in EA length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68806.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-20T02:36:19Z",
      "cve": "CVE-2025-68806",
      "id": "CVE-2025-68806",
      "initial_release_date": "2026-01-15T00:25:56Z",
      "product_status:known_not_affected": "287",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68806",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68806.json",
      "version": "8"
    }
  }
}



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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

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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.
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  • 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.