Vulnerability-Lookup

GHSA-MGH3-34FV-3J84

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate EaNameLength in smb2_get_ea()

smb2_get_ea() reads ea_req->EaNameLength from the client request and passes it directly to strncmp() as the comparison length without verifying that the length of the name really is the size of the input buffer received.

Fix this up by properly checking the size of the name based on the value received and the overall size of the request, to prevent a later strncmp() call to use the length as a "trusted" size of the buffer. Without this check, uninitialized heap values might be slowly leaked to the client.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31612"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate EaNameLength in smb2_get_ea()\n\nsmb2_get_ea() reads ea_req-\u003eEaNameLength from the client request and\npasses it directly to strncmp() as the comparison length without\nverifying that the length of the name really is the size of the input\nbuffer received.\n\nFix this up by properly checking the size of the name based on the value\nreceived and the overall size of the request, to prevent a later\nstrncmp() call to use the length as a \"trusted\" size of the buffer.\nWithout this check, uninitialized heap values might be slowly leaked to\nthe client.",
  "id": "GHSA-mgh3-34fv-3j84",
  "modified": "2026-04-24T15:32:35Z",
  "published": "2026-04-24T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31612"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/243b206bcb5a7137e8bddd57b2eec81e1ebd3859"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3363a770b193f555f29d76ddf4ced3305c0ccf6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/551dfb15b182abad4600eaf7b37e6eb7000d5b1b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfc6878d14acafffbe670bf2576620757a10a3d8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-31612 (GCVE-0-2026-31612)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-25 05:48

Title

ksmbd: validate EaNameLength in smb2_get_ea()

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate EaNameLength in smb2_get_ea() smb2_get_ea() reads ea_req->EaNameLength from the client request and passes it directly to strncmp() as the comparison length without verifying that the length of the name really is the size of the input buffer received. Fix this up by properly checking the size of the name based on the value received and the overall size of the request, to prevent a later strncmp() call to use the length as a "trusted" size of the buffer. Without this check, uninitialized heap values might be slowly leaked to the client.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/551dfb15b182abad4…
	https://git.kernel.org/stable/c/3363a770b193f555f…
	https://git.kernel.org/stable/c/243b206bcb5a7137e…
	https://git.kernel.org/stable/c/dfc6878d14acafffb…

Impacted products

Vendor

Product

Version

Linux

Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 551dfb15b182abad4600eaf7b37e6eb7000d5b1b (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 3363a770b193f555f29d76ddf4ced3305c0ccf6d (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 243b206bcb5a7137e8bddd57b2eec81e1ebd3859 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < dfc6878d14acafffbe670bf2576620757a10a3d8 (git)

Linux

Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "551dfb15b182abad4600eaf7b37e6eb7000d5b1b",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "3363a770b193f555f29d76ddf4ced3305c0ccf6d",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "243b206bcb5a7137e8bddd57b2eec81e1ebd3859",
              "status": "affected",
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              "versionType": "git"
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              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
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                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate EaNameLength in smb2_get_ea()\n\nsmb2_get_ea() reads ea_req-\u003eEaNameLength from the client request and\npasses it directly to strncmp() as the comparison length without\nverifying that the length of the name really is the size of the input\nbuffer received.\n\nFix this up by properly checking the size of the name based on the value\nreceived and the overall size of the request, to prevent a later\nstrncmp() call to use the length as a \"trusted\" size of the buffer.\nWithout this check, uninitialized heap values might be slowly leaked to\nthe client."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-25T05:48:19.554Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/551dfb15b182abad4600eaf7b37e6eb7000d5b1b"
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          "url": "https://git.kernel.org/stable/c/3363a770b193f555f29d76ddf4ced3305c0ccf6d"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/dfc6878d14acafffbe670bf2576620757a10a3d8"
        }
      ],
      "title": "ksmbd: validate EaNameLength in smb2_get_ea()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31612",
    "datePublished": "2026-04-24T14:42:32.760Z",
    "dateReserved": "2026-03-09T15:48:24.123Z",
    "dateUpdated": "2026-04-25T05:48:19.554Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-MGH3-34FV-3J84

CVE-2026-31612 (GCVE-0-2026-31612)

Tags

Sightings

Nomenclature