Vulnerability-Lookup

GHSA-8293-64HG-P37M

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-06 21:31

Details

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

smb: client: fix dir separator in SMB1 UNIX mounts

When calling cifs_mount_get_tcon() with SMB1 UNIX mounts, @cifs_sb->mnt_cifs_flags needs to be read or updated only after calling reset_cifs_unix_caps(), otherwise it might end up with missing CIFS_MOUNT_POSIXACL and CIFS_MOUNT_POSIX_PATHS bits.

This fixes the wrong dir separator used in paths caused by the missing CIFS_MOUNT_POSIX_PATHS bit in cifs_sb_info::mnt_cifs_flags.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31710"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T14:16:21Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix dir separator in SMB1 UNIX mounts\n\nWhen calling cifs_mount_get_tcon() with SMB1 UNIX mounts,\n@cifs_sb-\u003emnt_cifs_flags needs to be read or updated only after\ncalling reset_cifs_unix_caps(), otherwise it might end up with missing\nCIFS_MOUNT_POSIXACL and CIFS_MOUNT_POSIX_PATHS bits.\n\nThis fixes the wrong dir separator used in paths caused by the missing\nCIFS_MOUNT_POSIX_PATHS bit in cifs_sb_info::mnt_cifs_flags.",
  "id": "GHSA-8293-64hg-p37m",
  "modified": "2026-05-06T21:31:32Z",
  "published": "2026-05-01T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31710"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4d3fc5844d685441befd0caaab648321013cdfd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbbfcf35e1ee3396631f3dc6214cb626aa9814c3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31710 (GCVE-0-2026-31710)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-09-21 13:13

Title

smb: client: fix dir separator in SMB1 UNIX mounts

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix dir separator in SMB1 UNIX mounts When calling cifs_mount_get_tcon() with SMB1 UNIX mounts, @cifs_sb->mnt_cifs_flags needs to be read or updated only after calling reset_cifs_unix_caps(), otherwise it might end up with missing CIFS_MOUNT_POSIXACL and CIFS_MOUNT_POSIX_PATHS bits. This fixes the wrong dir separator used in paths caused by the missing CIFS_MOUNT_POSIX_PATHS bit in cifs_sb_info::mnt_cifs_flags.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/fbbfcf35e1ee33966…
https://git.kernel.org/stable/c/c4d3fc5844d685441…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4fc3a433c13944ee5766ec5b9bf6f1eb4d29b880 , < fbbfcf35e1ee3396631f3dc6214cb626aa9814c3 (git) Affected: 4fc3a433c13944ee5766ec5b9bf6f1eb4d29b880 , < c4d3fc5844d685441befd0caaab648321013cdfd (git) Affected: 9d9f6e06123001208cd8ae6332c7e814ab709169 (git) Affected: 6.18.53 , < 6.19 (semver)
Linux	Linux	Affected: 7.0 Unaffected: 0 , < 7.0 (semver) Unaffected: 7.0.2 , ≤ 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/connect.c",
            "fs/smb/client/smb1ops.c"
          ],
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              "versionType": "git"
            },
            {
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              "version": "9d9f6e06123001208cd8ae6332c7e814ab709169",
              "versionType": "git"
            },
            {
              "lessThan": "6.19",
              "status": "affected",
              "version": "6.18.53",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/connect.c",
            "fs/smb/client/smb1ops.c"
          ],
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          "versions": [
            {
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            },
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            },
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              "version": "7.0.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.2",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
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                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix dir separator in SMB1 UNIX mounts\n\nWhen calling cifs_mount_get_tcon() with SMB1 UNIX mounts,\n@cifs_sb-\u003emnt_cifs_flags needs to be read or updated only after\ncalling reset_cifs_unix_caps(), otherwise it might end up with missing\nCIFS_MOUNT_POSIXACL and CIFS_MOUNT_POSIX_PATHS bits.\n\nThis fixes the wrong dir separator used in paths caused by the missing\nCIFS_MOUNT_POSIX_PATHS bit in cifs_sb_info::mnt_cifs_flags."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T13:13:35.436Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      ],
      "title": "smb: client: fix dir separator in SMB1 UNIX mounts",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31710",
    "datePublished": "2026-05-01T13:56:07.217Z",
    "dateReserved": "2026-03-09T15:48:24.133Z",
    "dateUpdated": "2026-09-21T13:13:35.436Z",
    "state": "PUBLISHED"
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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.
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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-8293-64HG-P37M

CVE-2026-31710 (GCVE-0-2026-31710)

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