Vulnerability-Lookup

FKIE_CVE-2025-40291

Vulnerability from fkie_nvd - Published: 2025-12-08 01:16 - Updated: 2026-10-14 22:10

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix regbuf vector size truncation There is a report of io_estimate_bvec_size() truncating the calculated number of segments that leads to corruption issues. Check it doesn't overflow "int"s used later. Rough but simple, can be improved on top.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/146eb58629f45f8297e83d69e64d4eea4b28d972
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/826ce37a842633efe1bb763e4b13045d74060d72

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rsrc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "826ce37a842633efe1bb763e4b13045d74060d72",
              "status": "affected",
              "version": "9ef4cbbcb4ac3786a1a4164507511b76b2a572c5",
              "versionType": "git"
            },
            {
              "lessThan": "146eb58629f45f8297e83d69e64d4eea4b28d972",
              "status": "affected",
              "version": "9ef4cbbcb4ac3786a1a4164507511b76b2a572c5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rsrc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "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\nio_uring: fix regbuf vector size truncation\n\nThere is a report of io_estimate_bvec_size() truncating the calculated\nnumber of segments that leads to corruption issues. Check it doesn\u0027t\noverflow \"int\"s used later. Rough but simple, can be improved on top."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring: correcci\u00f3n del truncamiento del tama\u00f1o del vector regbuf\n\nExiste un informe de io_estimate_bvec_size() truncando el n\u00famero calculado de segmentos, lo que lleva a problemas de corrupci\u00f3n. Comprobar que no desborde los \u0027int\u0027 utilizados posteriormente. Basto pero simple, puede mejorarse posteriormente."
    }
  ],
  "id": "CVE-2025-40291",
  "lastModified": "2026-10-14T22:10:00.210",
  "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-08T01:16:01.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/146eb58629f45f8297e83d69e64d4eea4b28d972"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/826ce37a842633efe1bb763e4b13045d74060d72"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-40291 (GCVE-0-2025-40291)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-08-05 12:09

Title

io_uring: fix regbuf vector size truncation

Summary

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 6666 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/826ce37a842633efe…
https://git.kernel.org/stable/c/146eb58629f45f829…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9ef4cbbcb4ac3786a1a4164507511b76b2a572c5 , < 826ce37a842633efe1bb763e4b13045d74060d72 (git) Affected: 9ef4cbbcb4ac3786a1a4164507511b76b2a572c5 , < 146eb58629f45f8297e83d69e64d4eea4b28d972 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.17.8 , ≤ 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": [
            "io_uring/rsrc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "826ce37a842633efe1bb763e4b13045d74060d72",
              "status": "affected",
              "version": "9ef4cbbcb4ac3786a1a4164507511b76b2a572c5",
              "versionType": "git"
            },
            {
              "lessThan": "146eb58629f45f8297e83d69e64d4eea4b28d972",
              "status": "affected",
              "version": "9ef4cbbcb4ac3786a1a4164507511b76b2a572c5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rsrc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "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": "6.17.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix regbuf vector size truncation\n\nThere is a report of io_estimate_bvec_size() truncating the calculated\nnumber of segments that leads to corruption issues. Check it doesn\u0027t\noverflow \"int\"s used later. Rough but simple, can be improved on top."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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 vulnerable code is reached only through io_uring SQE submission (READV_FIXED/WRITEV_FIXED, zerocopy sendmsg, fixed uring_cmd), a local syscall interface; there is no remote network trigger despite one caller being in net.c.\nAC:L - The attacker fully controls the registered buffer and the iovec lengths that drive the truncated size estimate, so the under-allocation and out-of-bounds write are triggered deterministically with no race or uncontrolled condition.\nPR:L - Any unprivileged local user can create an io_uring instance and register buffers; io_uring is enabled by default (sysctl_io_uring_disabled=0) and requires no capabilities.\nUI:N - The attacker triggers the flaw entirely through their own io_uring operations with no victim interaction required.\nS:U - The corruption occurs within kernel heap memory in the same security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The integer-truncation-driven heap out-of-bounds access corrupts adjacent kernel objects and can be leveraged for arbitrary kernel-memory disclosure.\nI:H - The under-sized bvec allocation causes an out-of-bounds write of attacker-influenced bio_vec structures past the buffer, giving a heap write primitive exploitable for control-flow hijacking.\nA:H - The out-of-bounds heap write reliably corrupts kernel memory, causing oops/panic and denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:09:17.336Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/826ce37a842633efe1bb763e4b13045d74060d72"
        },
        {
          "url": "https://git.kernel.org/stable/c/146eb58629f45f8297e83d69e64d4eea4b28d972"
        }
      ],
      "title": "io_uring: fix regbuf vector size truncation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40291",
    "datePublished": "2025-12-08T00:46:14.601Z",
    "dateReserved": "2025-04-16T07:20:57.185Z",
    "dateUpdated": "2026-08-05T12:09:17.336Z",
    "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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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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