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CriticalFix available

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

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.12.88, 6.18.30, 6.6.140, 7.0.7
CVEs
CVE-2026-46155
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 01:47 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 28 May 2026, 09:36 UTC

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.

osv:CVE-2026-46155

Kernel

Fixed versions: 6.6.140, 6.12.88, 6.18.30, 7.0.7

Complete source record
{
  "id": "02f9149ecddaa3d77001325b24b4df4078623745d91217cca501f3edcc757810",
  "url": "https://osv.dev/vulnerability/CVE-2026-46155",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-46155",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.140",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.88",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.30",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-46155",
      "aliases": [
        "CVE-2026-46155"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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                }
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                },
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                },
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46155.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.6.140"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.88"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.9.0"
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                {
                  "fixed": "6.18.30"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.13.0"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46155.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.981043031Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/512d33bc8ea4ea5c19728ee118715f4b1f4d1926",
        "https://git.kernel.org/stable/c/8d09328dfda089675e4c049f3f256064a1d1996b",
        "https://git.kernel.org/stable/c/9b3af35645ff9cd334edc130249f9a2fb2bea25f",
        "https://git.kernel.org/stable/c/a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c",
        "https://git.kernel.org/stable/c/dffb44b2e06a2908e249f0f93156fc987eee1d1c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46155.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46155",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46155.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46155",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491649,
  "published_at": "2026-05-28T09:36:11.092+00:00"
}