Vulnerability-Lookup

GHSA-R5MC-MC43-5GCH

Vulnerability from github – Published: 2026-05-28 12:30 – Updated: 2026-05-28 12:30

Details

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

smb/client: fix out-of-bounds read in smb2_compound_op()

If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len.

Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]);

Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46155"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T10:16:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix out-of-bounds read in smb2_compound_op()\n\nIf a server sends a truncated response but a large OutputBufferLength, and\nterminates the EA list early, check_wsl_eas() returns success without\nvalidating that the entire OutputBufferLength fits within iov_len.\n\nThen smb2_compound_op() does:\n    memcpy(idata-\u003ewsl.eas, data[0], size[0]);\n\nWhere size[0] is OutputBufferLength. If iov_len is smaller than size[0],\nmemcpy can read beyond the end of the rsp_iov allocation and leak adjacent\nkernel heap memory.",
  "id": "GHSA-r5mc-mc43-5gch",
  "modified": "2026-05-28T12:30:30Z",
  "published": "2026-05-28T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46155"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dffb44b2e06a2908e249f0f93156fc987eee1d1c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46155 (GCVE-0-2026-46155)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-05-28 09:36

Title

smb/client: fix out-of-bounds read in smb2_compound_op()

Summary

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/dffb44b2e06a2908e…
https://git.kernel.org/stable/c/9b3af35645ff9cd33…
https://git.kernel.org/stable/c/512d33bc8ea4ea5c1…
https://git.kernel.org/stable/c/a16f70a71be4b5a4e…
https://git.kernel.org/stable/c/8d09328dfda089675…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7449d736bbbd160c76b01b8fcdf72f58a8757d4b , < dffb44b2e06a2908e249f0f93156fc987eee1d1c (git) Affected: ea41367b2a602f602ea6594fc4a310520dcc64f4 , < 9b3af35645ff9cd334edc130249f9a2fb2bea25f (git) Affected: ea41367b2a602f602ea6594fc4a310520dcc64f4 , < 512d33bc8ea4ea5c19728ee118715f4b1f4d1926 (git) Affected: ea41367b2a602f602ea6594fc4a310520dcc64f4 , < a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c (git) Affected: ea41367b2a602f602ea6594fc4a310520dcc64f4 , < 8d09328dfda089675e4c049f3f256064a1d1996b (git) Affected: 6.6.32 , < 6.6.140 (semver)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dffb44b2e06a2908e249f0f93156fc987eee1d1c",
              "status": "affected",
              "version": "7449d736bbbd160c76b01b8fcdf72f58a8757d4b",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "ea41367b2a602f602ea6594fc4a310520dcc64f4",
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            },
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              "lessThan": "512d33bc8ea4ea5c19728ee118715f4b1f4d1926",
              "status": "affected",
              "version": "ea41367b2a602f602ea6594fc4a310520dcc64f4",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "ea41367b2a602f602ea6594fc4a310520dcc64f4",
              "versionType": "git"
            },
            {
              "lessThan": "8d09328dfda089675e4c049f3f256064a1d1996b",
              "status": "affected",
              "version": "ea41367b2a602f602ea6594fc4a310520dcc64f4",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.140",
              "status": "affected",
              "version": "6.6.32",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "6.6.32",
                  "vulnerable": true
                },
                {
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                },
                {
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                },
                {
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                  "versionStartIncluding": "6.9",
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix out-of-bounds read in smb2_compound_op()\n\nIf a server sends a truncated response but a large OutputBufferLength, and\nterminates the EA list early, check_wsl_eas() returns success without\nvalidating that the entire OutputBufferLength fits within iov_len.\n\nThen smb2_compound_op() does:\n    memcpy(idata-\u003ewsl.eas, data[0], size[0]);\n\nWhere size[0] is OutputBufferLength. If iov_len is smaller than size[0],\nmemcpy can read beyond the end of the rsp_iov allocation and leak adjacent\nkernel heap memory."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-28T09:36:11.092Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dffb44b2e06a2908e249f0f93156fc987eee1d1c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25f"
        },
        {
          "url": "https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926"
        },
        {
          "url": "https://git.kernel.org/stable/c/a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996b"
        }
      ],
      "title": "smb/client: fix out-of-bounds read in smb2_compound_op()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46155",
    "datePublished": "2026-05-28T09:36:11.092Z",
    "dateReserved": "2026-05-13T15:03:33.102Z",
    "dateUpdated": "2026-05-28T09:36:11.092Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-R5MC-MC43-5GCH

CVE-2026-46155 (GCVE-0-2026-46155)

Tags

Sightings

Nomenclature