fkie_nvd - fkie_cve-2025-39822

fkie_cve-2025-39822

Vulnerability from fkie_nvd

Published

2025-09-16 13:15

Modified

2025-09-17 14:18

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: fix signedness in this_len calculation When importing and using buffers, buf->len is considered unsigned. However, buf->len is converted to signed int when committing. This can lead to unexpected behavior if the buffer is large enough to be interpreted as a negative value. Make min_t calculation unsigned.

References

▼	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: fix signedness in this_len calculation\n\nWhen importing and using buffers, buf-\u003elen is considered unsigned.\nHowever, buf-\u003elen is converted to signed int when committing. This can\nlead to unexpected behavior if the buffer is large enough to be\ninterpreted as a negative value. Make min_t calculation unsigned."
    }
  ],
  "id": "CVE-2025-39822",
  "lastModified": "2025-09-17T14:18:55.093",
  "metrics": {},
  "published": "2025-09-16T13:15:59.873",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2025-39822 (GCVE-0-2025-39822)

Vulnerability from cvelistv5

Published

2025-09-16 13:00

Modified

2025-09-29 06:00

Severity ?

Summary

References

▼	URL	Tags
	https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1
	https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21

Impacted products

Vendor

Product

Version

▼

Linux

Version: ae98dbf43d755b4e111fcd086e53939bef3e9a1a
Version: ae98dbf43d755b4e111fcd086e53939bef3e9a1a

Linux

Version: 6.12

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/kbuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f4f411c068402c370c4f9a9d4950a97af97bbbb1",
              "status": "affected",
              "version": "ae98dbf43d755b4e111fcd086e53939bef3e9a1a",
              "versionType": "git"
            },
            {
              "lessThan": "c64eff368ac676e8540344d27a3de47e0ad90d21",
              "status": "affected",
              "version": "ae98dbf43d755b4e111fcd086e53939bef3e9a1a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/kbuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.5",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: fix signedness in this_len calculation\n\nWhen importing and using buffers, buf-\u003elen is considered unsigned.\nHowever, buf-\u003elen is converted to signed int when committing. This can\nlead to unexpected behavior if the buffer is large enough to be\ninterpreted as a negative value. Make min_t calculation unsigned."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:00:22.299Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1"
        },
        {
          "url": "https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21"
        }
      ],
      "title": "io_uring/kbuf: fix signedness in this_len calculation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39822",
    "datePublished": "2025-09-16T13:00:21.533Z",
    "dateReserved": "2025-04-16T07:20:57.139Z",
    "dateUpdated": "2025-09-29T06:00:22.299Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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