CVE-2026-97561 (GCVE-0-2026-97561)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:21 – Updated: 2026-10-30 12:37
VLAI
Title
smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid When the administrator mounts with forceuid or forcegid (uid=/gid= mount options), they expect all files to appear owned by the specified user/group. However, several code paths unconditionally called sid_to_id() to overwrite cf_uid/cf_gid with server-provided values, ignoring the administrator's explicit override: - smb311_posix_info_to_fattr() (stat via POSIX extensions) - cifs_posix_to_fattr() (readdir via POSIX extensions) - parse_sec_desc() (CIFS ACL ownership mapping) This allowed an untrusted server to dictate local file ownership even when the mount was configured to force specific uid/gid values. Fix all three call sites to check CIFS_MOUNT_OVERR_UID and CIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the same pattern already used by cifs_unix_basic_to_fattr() for unix extensions.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9409ae58e0759d010b347e7b19ebc90ab5d4b98f , < 89a3b4704af2208e381c55037ff2d1e2365b83e4 (git)
Affected: 9409ae58e0759d010b347e7b19ebc90ab5d4b98f , < be6eccccec867c22d7c65fab4ea4e91ec3d5b8c6 (git)
Affected: 9409ae58e0759d010b347e7b19ebc90ab5d4b98f , < bc35de451c128d399ad185d6269f8847e97cd1c9 (git)
Affected: 9409ae58e0759d010b347e7b19ebc90ab5d4b98f , < 6ac7a29691558bed18e2df1780636b8aa0fd13d5 (git)
Affected: 9409ae58e0759d010b347e7b19ebc90ab5d4b98f , < e1b74f8f8c1d13190b09fe623b729d36b7ac22a8 (git)
Affected: 9409ae58e0759d010b347e7b19ebc90ab5d4b98f , < 18a72975e9f35aadecc75b031f693f2d1f49308f (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "programFiles": [
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              "versionType": "semver"
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              "status": "unaffected",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: honor forceuid/forcegid when mapping SIDs to uid/gid\n\nWhen the administrator mounts with forceuid or forcegid (uid=/gid=\nmount options), they expect all files to appear owned by the specified\nuser/group.  However, several code paths unconditionally called\nsid_to_id() to overwrite cf_uid/cf_gid with server-provided values,\nignoring the administrator\u0027s explicit override:\n\n  - smb311_posix_info_to_fattr() (stat via POSIX extensions)\n  - cifs_posix_to_fattr() (readdir via POSIX extensions)\n  - parse_sec_desc() (CIFS ACL ownership mapping)\n\nThis allowed an untrusted server to dictate local file ownership even\nwhen the mount was configured to force specific uid/gid values.\n\nFix all three call sites to check CIFS_MOUNT_OVERR_UID and\nCIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the\nsame pattern already used by cifs_unix_basic_to_fattr() for unix\nextensions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:37:25.329Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "datePublished": "2026-09-25T10:21:50.067Z",
    "dateReserved": "2026-09-24T16:01:01.155Z",
    "dateUpdated": "2026-10-30T12:37:25.329Z",
    "state": "PUBLISHED"
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      "date": "2026-11-01",
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      "percentile": "0.11501"
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      "cve": "CVE-2026-97561",
      "id": "msrc_CVE-2026-97561",
      "initial_release_date": "2026-09-27T23:33:30.000Z",
      "product_status:known_affected": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97561.json",
      "version": "2"
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                "product": "Linux",
                "programFiles": [
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                  "fs/smb/client/inode.c",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: honor forceuid/forcegid when mapping SIDs to uid/gid\n\nWhen the administrator mounts with forceuid or forcegid (uid=/gid=\nmount options), they expect all files to appear owned by the specified\nuser/group.  However, several code paths unconditionally called\nsid_to_id() to overwrite cf_uid/cf_gid with server-provided values,\nignoring the administrator\u0027s explicit override:\n\n  - smb311_posix_info_to_fattr() (stat via POSIX extensions)\n  - cifs_posix_to_fattr() (readdir via POSIX extensions)\n  - parse_sec_desc() (CIFS ACL ownership mapping)\n\nThis allowed an untrusted server to dictate local file ownership even\nwhen the mount was configured to force specific uid/gid values.\n\nFix all three call sites to check CIFS_MOUNT_OVERR_UID and\nCIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the\nsame pattern already used by cifs_unix_basic_to_fattr() for unix\nextensions."
          }
        ],
        "id": "CVE-2026-97561",
        "lastModified": "2026-10-30T13:21:08.230",
        "metrics": {},
        "published": "2026-09-25T11:17:06.657",
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T06:31:22+00:00",
      "cve": "CVE-2026-97561",
      "id": "CVE-2026-97561",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "237",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97561.json",
      "version": "3"
    }
  }
}



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