Vulnerability-Lookup

FKIE_CVE-2025-68243

Vulnerability from fkie_nvd - Published: 2025-12-16 15:15 - Updated: 2026-10-14 13:10

Severity

7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: NFS: Check the TLS certificate fields in nfs_match_client() If the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the cert_serial and privkey_serial fields need to match as well since they define the client's identity, as presented to the server.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b8fa37219074811c04d4ecb742c73e2b296da6a8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fb2cba0854a7f315c8100a807a6959b99d72479e

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/client.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b8fa37219074811c04d4ecb742c73e2b296da6a8",
              "status": "affected",
              "version": "90c9550a8d65fb9b1bf87baf97a04ed91bf61b33",
              "versionType": "git"
            },
            {
              "lessThan": "fb2cba0854a7f315c8100a807a6959b99d72479e",
              "status": "affected",
              "version": "90c9550a8d65fb9b1bf87baf97a04ed91bf61b33",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/client.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Check the TLS certificate fields in nfs_match_client()\n\nIf the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the\ncert_serial and privkey_serial fields need to match as well since they\ndefine the client\u0027s identity, as presented to the server."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nNFS: Comprobar los campos del certificado TLS en nfs_match_client()\n\nSi la pol\u00edtica de seguridad TLS es de tipo RPC_XPRTSEC_TLS_X509, entonces los campos cert_serial y privkey_serial tambi\u00e9n deben coincidir, ya que definen la identidad del cliente, tal como se presenta al servidor."
    }
  ],
  "id": "CVE-2025-68243",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-16T15:15:53.547",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b8fa37219074811c04d4ecb742c73e2b296da6a8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fb2cba0854a7f315c8100a807a6959b99d72479e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-68243 (GCVE-0-2025-68243)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:21 – Updated: 2026-08-05 12:10

Title

NFS: Check the TLS certificate fields in nfs_match_client()

Summary

Severity

7 (High)


                        
                          CVSS:3.1/AV:L/AC:H/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 6664 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/b8fa37219074811c0…
https://git.kernel.org/stable/c/fb2cba0854a7f315c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 , < b8fa37219074811c04d4ecb742c73e2b296da6a8 (git) Affected: 90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 , < fb2cba0854a7f315c8100a807a6959b99d72479e (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.17.9 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/client.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b8fa37219074811c04d4ecb742c73e2b296da6a8",
              "status": "affected",
              "version": "90c9550a8d65fb9b1bf87baf97a04ed91bf61b33",
              "versionType": "git"
            },
            {
              "lessThan": "fb2cba0854a7f315c8100a807a6959b99d72479e",
              "status": "affected",
              "version": "90c9550a8d65fb9b1bf87baf97a04ed91bf61b33",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/client.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.9",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Check the TLS certificate fields in nfs_match_client()\n\nIf the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the\ncert_serial and privkey_serial fields need to match as well since they\ndefine the client\u0027s identity, as presented to the server."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable matching occurs during local NFS client setup or an internal referral/pNFS automount. A local attacker can consume an incorrectly credentialed mount, but arbitrary network packets alone cannot create the required client collision.\nAC:H - Exploitation requires a pre-existing mTLS client in the same network namespace with matching endpoint, protocol, NFS version, and minor version but a different, more privileged certificate, created in the favorable order. These deployment conditions are outside an unprivileged attacker\u2019s control.\nPR:L - Directly creating the conflicting mount requires initial-user-namespace CAP_SYS_ADMIN because affected NFS filesystems lack FS_USERNS_MOUNT. However, an ordinary local user with access to an administrator-created misbound mount can exploit the stronger certificate identity.\nUI:N - Once the conflicting mounts or internal NFS clients exist, the attacker can access the misbound mount directly without another user taking an action.\nS:U - The flaw changes which NFS client identity the kernel presents but does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - Reusing a more privileged client certificate can bypass server-side certificate authorization and expose entire sensitive NFS exports to unauthorized reads.\nI:H - If the inherited certificate authorizes write access, the attacker can modify or delete arbitrary data throughout protected NFS exports.\nA:H - The stronger identity can authorize destructive operations against service-critical exports, permitting deletion or corruption that makes the hosted data or dependent services unavailable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:10:25.864Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b8fa37219074811c04d4ecb742c73e2b296da6a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb2cba0854a7f315c8100a807a6959b99d72479e"
        }
      ],
      "title": "NFS: Check the TLS certificate fields in nfs_match_client()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68243",
    "datePublished": "2025-12-16T14:21:20.421Z",
    "dateReserved": "2025-12-16T13:41:40.263Z",
    "dateUpdated": "2026-08-05T12:10:25.864Z",
    "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.

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