Vulnerability-Lookup

GHSA-89GF-R4Q6-P3C9

Vulnerability from github – Published: 2026-05-28 12:30 – Updated: 2026-06-01 18:31

Details

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

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

Since smb2_check_message() returns success without length validation for the symlink error response, in symlink_data() it is possible for iov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer only contains the base SMB2 header (64 bytes), accessing err->ErrorContextCount (at offset 66) or err->ByteCount later in symlink_data() will cause an out-of-bounds read.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46185"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T10:16:34Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix out-of-bounds read in symlink_data()\n\nSince smb2_check_message() returns success without length validation for\nthe symlink error response, in symlink_data() it is possible for\niov-\u003eiov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer\nonly contains the base SMB2 header (64 bytes), accessing\nerr-\u003eErrorContextCount (at offset 66) or err-\u003eByteCount later in\nsymlink_data() will cause an out-of-bounds read.",
  "id": "GHSA-89gf-r4q6-p3c9",
  "modified": "2026-06-01T18:31:41Z",
  "published": "2026-05-28T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46185"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15dc0a4de743a1aaa7b859b3aea79f08c695396c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2be11faf79e49fb8250a181ff0b4d2b2f084af83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8c8a704f0bc133deb171f6aeb6f3a684203e212"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9561402489d41149f63e001a74384863b7b30a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d62b8d236fab503c6fec1d3e9a38bea71feaca20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef6495d4df6e7af8f3de67e65150881c880f696c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-46185 (GCVE-0-2026-46185)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-08-05 12:30

Title

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

Summary

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in symlink_data() Since smb2_check_message() returns success without length validation for the symlink error response, in symlink_data() it is possible for iov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer only contains the base SMB2 header (64 bytes), accessing err->ErrorContextCount (at offset 66) or err->ByteCount later in symlink_data() will cause an out-of-bounds read.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/2be11faf79e49fb82…
https://git.kernel.org/stable/c/ef6495d4df6e7af8f…
https://git.kernel.org/stable/c/15dc0a4de743a1aaa…
https://git.kernel.org/stable/c/b8c8a704f0bc133de…
https://git.kernel.org/stable/c/b9561402489d41149…
https://git.kernel.org/stable/c/d62b8d236fab503c6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 2be11faf79e49fb8250a181ff0b4d2b2f084af83 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < ef6495d4df6e7af8f3de67e65150881c880f696c (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 15dc0a4de743a1aaa7b859b3aea79f08c695396c (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < b8c8a704f0bc133deb171f6aeb6f3a684203e212 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < b9561402489d41149f63e001a74384863b7b30a6 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < d62b8d236fab503c6fec1d3e9a38bea71feaca20 (git) Affected: 2d046892a493d9760c35fdaefc3017f27f91b621 (git) Affected: 6.0.16 , < 6.1 (semver)
Linux	Linux	Affected: 6.1 Unaffected: 0 , < 6.1 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (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 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "2be11faf79e49fb8250a181ff0b4d2b2f084af83",
              "status": "affected",
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              "versionType": "git"
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              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
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              "versionType": "git"
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            {
              "status": "affected",
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              "version": "6.1"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
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              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.1",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix out-of-bounds read in symlink_data()\n\nSince smb2_check_message() returns success without length validation for\nthe symlink error response, in symlink_data() it is possible for\niov-\u003eiov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer\nonly contains the base SMB2 header (64 bytes), accessing\nerr-\u003eErrorContextCount (at offset 66) or err-\u003eByteCount later in\nsymlink_data() will cause an out-of-bounds read."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerability is in the SMB *client*, triggered by a crafted symlink error response from a remote (malicious, compromised, or MITM) SMB server over TCP/445; it processes attacker-controlled data from a remote network peer.\nAC:L - A malicious server can deterministically return a CREATE response with STATUS_STOPPED_ON_SYMLINK and len \u003c calc_len (e.g., only the 64-byte base header), reliably reaching symlink_data() with no race or attacker-uncontrolled condition.\nPR:N - The attacker is the remote SMB server; it requires no credentials or privileges on the victim client to send the malformed response, which is parsed during normal open/error handling.\nUI:N - Once a share is mounted (e.g., persistent fstab/autofs mount to a compromised or MITM\u0027d server), routine file access makes the server return the crafted symlink error with no additional victim action required per exploit.\nS:U - The out-of-bounds read stays within the client kernel\u0027s own memory and security authority; no privilege or sandbox boundary is crossed.\nC:H - An out-of-bounds read of adjacent kernel heap memory; in this same symlink-parse path (cf. CVE-2026-31613) OOB bytes are UTF-16-decoded into the symlink target and returned to userspace via readlink(2).\nI:N - The flaw is purely an out-of-bounds read of the error response buffer; it does not modify kernel memory.\nA:H - Reading past the message bounds can dereference invalid/unmapped memory and oops the client kernel, causing a denial of service."
            }
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        }
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        "dateUpdated": "2026-08-05T12:30:18.630Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/d62b8d236fab503c6fec1d3e9a38bea71feaca20"
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      ],
      "title": "smb/client: fix out-of-bounds read in symlink_data()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46185",
    "datePublished": "2026-05-28T09:36:39.318Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-08-05T12:30:18.630Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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