Vulnerability-Lookup

FKIE_CVE-2025-40129

Vulnerability from fkie_nvd - Published: 2025-11-12 11:15 - Updated: 2026-07-30 06:24

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix null pointer dereference on zero-length checksum In xdr_stream_decode_opaque_auth(), zero-length checksum.len causes checksum.data to be set to NULL. This triggers a NPD when accessing checksum.data in gss_krb5_verify_mic_v2(). This patch ensures that the value of checksum.len is not less than XDR_UNIT.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/81cec07d303186d0d8c623ef8b5ecd3b81e94cf6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ab9a70cd2386a0d70c164b0905dd66bc9af52e77
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/affc03d44921f493deaae1d33151e3067a6f9f8f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/auth_gss/svcauth_gss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "81cec07d303186d0d8c623ef8b5ecd3b81e94cf6",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            },
            {
              "lessThan": "affc03d44921f493deaae1d33151e3067a6f9f8f",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            },
            {
              "lessThan": "ab9a70cd2386a0d70c164b0905dd66bc9af52e77",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            },
            {
              "lessThan": "6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/auth_gss/svcauth_gss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "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\nsunrpc: fix null pointer dereference on zero-length checksum\n\nIn xdr_stream_decode_opaque_auth(), zero-length checksum.len causes\nchecksum.data to be set to NULL. This triggers a NPD when accessing\nchecksum.data in gss_krb5_verify_mic_v2(). This patch ensures that\nthe value of checksum.len is not less than XDR_UNIT."
    }
  ],
  "id": "CVE-2025-40129",
  "lastModified": "2026-07-30T06:24:12.860",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-11-12T11:15:42.513",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/81cec07d303186d0d8c623ef8b5ecd3b81e94cf6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab9a70cd2386a0d70c164b0905dd66bc9af52e77"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/affc03d44921f493deaae1d33151e3067a6f9f8f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-40129 (GCVE-0-2025-40129)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-08-05 12:07

Title

sunrpc: fix null pointer dereference on zero-length checksum

Summary

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/81cec07d303186d0d…
https://git.kernel.org/stable/c/affc03d44921f493d…
https://git.kernel.org/stable/c/ab9a70cd2386a0d70…
https://git.kernel.org/stable/c/6df164e29bd4e6505…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6 (git) Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < affc03d44921f493deaae1d33151e3067a6f9f8f (git) Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < ab9a70cd2386a0d70c164b0905dd66bc9af52e77 (git) Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < 6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42 (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.112 , ≤ 6.6.* (semver) Unaffected: 6.12.53 , ≤ 6.12.* (semver) Unaffected: 6.17.3 , ≤ 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": [
            "net/sunrpc/auth_gss/svcauth_gss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "81cec07d303186d0d8c623ef8b5ecd3b81e94cf6",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            },
            {
              "lessThan": "affc03d44921f493deaae1d33151e3067a6f9f8f",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            },
            {
              "lessThan": "ab9a70cd2386a0d70c164b0905dd66bc9af52e77",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            },
            {
              "lessThan": "6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42",
              "status": "affected",
              "version": "0653028e8f1c97fec30710813a001ad8a2ec34f4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/auth_gss/svcauth_gss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "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": "6.6.112",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix null pointer dereference on zero-length checksum\n\nIn xdr_stream_decode_opaque_auth(), zero-length checksum.len causes\nchecksum.data to be set to NULL. This triggers a NPD when accessing\nchecksum.data in gss_krb5_verify_mic_v2(). This patch ensures that\nthe value of checksum.len is not less than XDR_UNIT."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is the server-side RPCSEC_GSS verifier path in the kernel\u0027s SUNRPC server (used by nfsd on TCP/2049), parsing attacker-supplied XDR from a received RPC Call. No local access is needed \u2014 a crafted RPC packet reaches `svcauth_gss_accept()` \u2192 `svcauth_gss_verify_header()` directly.\nAC:L - The attacker deterministically triggers the bug by emitting a single RPC_AUTH_GSS Call with a zero-length verifier body; there is no race, no memory-layout dependency, and no state the attacker cannot influence. Kerberized NFS (CONFIG_SUNRPC_GSS with gssproxy/rpc.svcgssd) is a standard enterprise deployment, not a rare config.\nPR:N - `svcauth_gss_verify_header()` runs before any credential is verified \u2014 it is the code that performs the verification \u2014 and the only gate is an rsc-cache lookup on the GSS context handle, which is a monotonically increasing 64-bit counter starting at 1 (`gss_proxy_save_rsc()`) sent in cleartext on the wire in every RPCSEC_GSS request. An unauthenticated remote attacker can trivially enumerate or sniff a valid handle and then supply the malformed verifier.\nUI:N - The crash is triggered entirely by an inbound RPC message processed by the nfsd service thread. No administrator or client-side action is required.\nS:U - The fault occurs and takes effect within the kernel of the NFS server itself, with no crossing of a virtualization, IOMMU, or other security-authority boundary.\nC:N - The defect is a read of address 0 (`memcpy(\u0026be16_ptr, NULL, 2)`); it faults immediately and returns no data to the attacker. No memory contents are disclosed and no pointer values are leaked over the wire.\nI:N - No attacker-controlled data is written anywhere \u2014 the NULL pointer is only dereferenced for reading, and the request is aborted by the oops. There is no corruption primitive and no authentication bypass (the MIC check itself still fails).\nA:H - The NULL dereference oopses the nfsd kernel thread \u2014 and panics the host outright where `panic_on_oops` is set \u2014 and can be replayed indefinitely to kill every service thread, denying NFS service entirely."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:58.258Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/81cec07d303186d0d8c623ef8b5ecd3b81e94cf6"
        },
        {
          "url": "https://git.kernel.org/stable/c/affc03d44921f493deaae1d33151e3067a6f9f8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab9a70cd2386a0d70c164b0905dd66bc9af52e77"
        },
        {
          "url": "https://git.kernel.org/stable/c/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42"
        }
      ],
      "title": "sunrpc: fix null pointer dereference on zero-length checksum",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40129",
    "datePublished": "2025-11-12T10:23:21.327Z",
    "dateReserved": "2025-04-16T07:20:57.170Z",
    "dateUpdated": "2026-08-05T12:07:58.258Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2025-40129

CVE-2025-40129 (GCVE-0-2025-40129)

Tags

Sightings

Nomenclature

Related by attack behaviour