Vulnerability-Lookup

GHSA-3JXR-5523-52VG

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-28 09:31

Details

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

smb/client: fix possible infinite loop and oob read in symlink_data()

On 32-bit architectures, the infinite loop is as follows:

len = p->ErrorDataLength == 0xfffffff8 u8 *next = p->ErrorContextData + len next == p

On 32-bit architectures, the out-of-bounds read is as follows:

len = p->ErrorDataLength == 0xfffffff0 u8 next = p->ErrorContextData + len next == (u8 )p - 8

Severity

8.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52967"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:07Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix possible infinite loop and oob read in symlink_data()\n\nOn 32-bit architectures, the infinite loop is as follows:\n\n  len = p-\u003eErrorDataLength == 0xfffffff8\n  u8 *next = p-\u003eErrorContextData + len\n  next == p\n\nOn 32-bit architectures, the out-of-bounds read is as follows:\n\n  len = p-\u003eErrorDataLength == 0xfffffff0\n  u8 *next = p-\u003eErrorContextData + len\n  next == (u8 *)p - 8",
  "id": "GHSA-3jxr-5523-52vg",
  "modified": "2026-06-28T09:31:37Z",
  "published": "2026-06-24T18:32:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52967"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b9331b16b0ed9414dcf7583d8134bdfeb117aae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cfa2d59f669db28d6292d10ff87ca6837c781b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d9a7f1f96cd617ee9e75bb22217c709038e26b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b41598bf54b3fe528994e573df6008f8f4d0a4f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-52967 (GCVE-0-2026-52967)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32

Title

smb/client: fix possible infinite loop and oob read in symlink_data()

Summary

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix possible infinite loop and oob read in symlink_data() On 32-bit architectures, the infinite loop is as follows: len = p->ErrorDataLength == 0xfffffff8 u8 *next = p->ErrorContextData + len next == p On 32-bit architectures, the out-of-bounds read is as follows: len = p->ErrorDataLength == 0xfffffff0 u8 *next = p->ErrorContextData + len next == (u8 *)p - 8

Severity

8.1 (High)


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

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/1cfa2d59f669db28d…
https://git.kernel.org/stable/c/b41598bf54b3fe528…
https://git.kernel.org/stable/c/cd4b9b662f0fb9aa9…
https://git.kernel.org/stable/c/97a05b0ae9ea5ec05…
https://git.kernel.org/stable/c/1b9331b16b0ed9414…
https://git.kernel.org/stable/c/7d9a7f1f96cd617ee…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 1cfa2d59f669db28d6292d10ff87ca6837c781b0 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < b41598bf54b3fe528994e573df6008f8f4d0a4f4 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23 (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 1b9331b16b0ed9414dcf7583d8134bdfeb117aae (git) Affected: 76894f3e2f71177747b8b4763fb180e800279585 , < 7d9a7f1f96cd617ee9e75bb22217c709038e26b8 (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: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 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/smb2file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1cfa2d59f669db28d6292d10ff87ca6837c781b0",
              "status": "affected",
              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
            },
            {
              "lessThan": "b41598bf54b3fe528994e573df6008f8f4d0a4f4",
              "status": "affected",
              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
            },
            {
              "lessThan": "cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23",
              "status": "affected",
              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
            },
            {
              "lessThan": "97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb",
              "status": "affected",
              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
            },
            {
              "lessThan": "1b9331b16b0ed9414dcf7583d8134bdfeb117aae",
              "status": "affected",
              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
            },
            {
              "lessThan": "7d9a7f1f96cd617ee9e75bb22217c709038e26b8",
              "status": "affected",
              "version": "76894f3e2f71177747b8b4763fb180e800279585",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2d046892a493d9760c35fdaefc3017f27f91b621",
              "versionType": "git"
            },
            {
              "lessThan": "6.1",
              "status": "affected",
              "version": "6.0.16",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.0.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix possible infinite loop and oob read in symlink_data()\n\nOn 32-bit architectures, the infinite loop is as follows:\n\n  len = p-\u003eErrorDataLength == 0xfffffff8\n  u8 *next = p-\u003eErrorContextData + len\n  next == p\n\nOn 32-bit architectures, the out-of-bounds read is as follows:\n\n  len = p-\u003eErrorDataLength == 0xfffffff0\n  u8 *next = p-\u003eErrorContextData + len\n  next == (u8 *)p - 8"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable SMB client parser consumes an SMB2 CREATE error response supplied by a remote SMB server over the network. A malicious or compromised SMB share can send the crafted `STATUS_STOPPED_ON_SYMLINK` response.\nAC:L - The server directly controls `ErrorContextCount`, `ByteCount`, `ErrorId`, and `ErrorDataLength`, and no race or hard-to-hit state is required. Although the wraparound behavior is 32-bit specific, that is a deployment property rather than an attacker-uncontrolled exploitation condition.\nPR:N - The attacker needs no privileges on the victim system; they only need to operate or control the SMB server endpoint that the client connects to. The path can also be reached through guest or null-auth SMB sessions.\nUI:R - The victim client must mount/connect to the SMB share and perform a path operation such as lookup, stat, open, or create that causes an SMB2 CREATE response to be parsed. The remote server cannot trigger this parser without client-side filesystem activity.\nS:U - The affected component is the Linux kernel SMB client, and the impact is to the same kernel/client security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox escape.\nC:H - The bug is an out-of-bounds kernel read in a server-controlled response parser, and the read is not strictly bounded to only a few harmless bytes. Following the required conservative rule, this is scored as high confidentiality impact.\nI:N - The defect advances a parser pointer incorrectly and reads from the wrong location, but it does not write out of bounds or provide a kernel memory write primitive. No direct integrity impact beyond normal malicious-server control of SMB content was identified.\nA:H - The crafted length can make the parser loop indefinitely on 32-bit systems, causing a reliable denial of service. Other malformed pointer positions can also lead to invalid kernel reads and possible oops conditions."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:11.748Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/1cfa2d59f669db28d6292d10ff87ca6837c781b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b41598bf54b3fe528994e573df6008f8f4d0a4f4"
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          "url": "https://git.kernel.org/stable/c/97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b9331b16b0ed9414dcf7583d8134bdfeb117aae"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d9a7f1f96cd617ee9e75bb22217c709038e26b8"
        }
      ],
      "title": "smb/client: fix possible infinite loop and oob read in symlink_data()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52967",
    "datePublished": "2026-06-24T16:28:46.661Z",
    "dateReserved": "2026-06-09T07:44:35.374Z",
    "dateUpdated": "2026-08-05T12:32:11.748Z",
    "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.

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.
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GHSA-3JXR-5523-52VG

CVE-2026-52967 (GCVE-0-2026-52967)

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