CVE-2025-68212 (GCVE-0-2025-68212)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:57 – Updated: 2026-08-05 12:10
VLAI
Title
fs: Fix uninitialized 'offp' in statmount_string()
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: Fix uninitialized 'offp' in statmount_string() In statmount_string(), most flags assign an output offset pointer (offp) which is later updated with the string offset. However, the STATMOUNT_MNT_UIDMAP and STATMOUNT_MNT_GIDMAP cases directly set the struct fields instead of using offp. This leaves offp uninitialized, leading to a possible uninitialized dereference when *offp is updated. Fix it by assigning offp for UIDMAP and GIDMAP as well, keeping the code path consistent.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 37c4a9590e1efcae7749682239fc22a330d2d325 , < acfde9400e611c8d2668f1c70053c4a1d6ecfc36 (git)
Affected: 37c4a9590e1efcae7749682239fc22a330d2d325 , < 0778ac7df5137d5041783fadfc201f8fd55a1d9b (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/namespace.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "37c4a9590e1efcae7749682239fc22a330d2d325",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Fix uninitialized \u0027offp\u0027 in statmount_string()\n\nIn statmount_string(), most flags assign an output offset pointer (offp)\nwhich is later updated with the string offset. However, the\nSTATMOUNT_MNT_UIDMAP and STATMOUNT_MNT_GIDMAP cases directly set the\nstruct fields instead of using offp. This leaves offp uninitialized,\nleading to a possible uninitialized dereference when *offp is updated.\n\nFix it by assigning offp for UIDMAP and GIDMAP as well, keeping the code\npath consistent."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached through the local statmount() syscall by requesting UID or GID mappings for an idmapped mount.\nAC:L - No race or uncontrollable condition is required; an attacker can reliably issue the request against a visible idmapped mount with a resolvable mapping.\nPR:L - No capability is required for a mount reachable beneath the caller\u0027s root, and an unprivileged user can access or create suitable idmapped mounts through user namespaces.\nUI:N - Exploitation requires only attacker-controlled syscalls and no action by another user.\nS:U - The corruption affects the host kernel within the same operating-system security authority, so ordinary privilege escalation does not change scope.\nC:H - The uninitialized write can partially corrupt seq.buf before it is used as a copy_to_user() source, creating a plausible kernel-memory disclosure primitive.\nI:H - The four-byte kernel write corrupts live pointers such as root.mnt or seq.buf, which are subsequently passed to mntput() or kvfree(), enabling further memory corruption and potential code execution.\nA:H - The malformed pointer is subsequently dereferenced or freed, producing a repeatable kernel oops and potentially a system-wide panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:10:14.921Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/acfde9400e611c8d2668f1c70053c4a1d6ecfc36"
        },
        {
          "url": "https://git.kernel.org/stable/c/0778ac7df5137d5041783fadfc201f8fd55a1d9b"
        }
      ],
      "title": "fs: Fix uninitialized \u0027offp\u0027 in statmount_string()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68212",
    "datePublished": "2025-12-16T13:57:08.327Z",
    "dateReserved": "2025-12-16T13:41:40.256Z",
    "dateUpdated": "2026-08-05T12:10:14.921Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-08",
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      "percentile": "0.03726"
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                "product": "Linux",
                "programFiles": [
                  "fs/namespace.c"
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                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
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                    "versionType": "git"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Fix uninitialized \u0027offp\u0027 in statmount_string()\n\nIn statmount_string(), most flags assign an output offset pointer (offp)\nwhich is later updated with the string offset. However, the\nSTATMOUNT_MNT_UIDMAP and STATMOUNT_MNT_GIDMAP cases directly set the\nstruct fields instead of using offp. This leaves offp uninitialized,\nleading to a possible uninitialized dereference when *offp is updated.\n\nFix it by assigning offp for UIDMAP and GIDMAP as well, keeping the code\npath consistent."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: Correcci\u00f3n de \u0027offp\u0027 no inicializado en statmount_string()\n\nEn statmount_string(), la mayor\u00eda de las banderas asignan un puntero de desplazamiento de salida (offp) que luego se actualiza con el desplazamiento de la cadena. Sin embargo, los casos STATMOUNT_MNT_UIDMAP y STATMOUNT_MNT_GIDMAP establecen directamente los campos de la estructura en lugar de usar offp. Esto deja a offp sin inicializar, lo que lleva a una posible desreferencia no inicializada cuando offp se actualiza.\n\nCorr\u00edjalo asignando offp tambi\u00e9n para UIDMAP y GIDMAP, manteniendo la ruta del c\u00f3digo consistente."
          }
        ],
        "id": "CVE-2025-68212",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2025-12-16T14:15:54.140",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0778ac7df5137d5041783fadfc201f8fd55a1d9b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/acfde9400e611c8d2668f1c70053c4a1d6ecfc36"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T04:41:06+00:00",
      "cve": "CVE-2025-68212",
      "id": "CVE-2025-68212",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "186",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs: Fix uninitialized \u0027offp\u0027 in statmount_string()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68212.json",
      "version": "3"
    }
  }
}



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