Vulnerability-Lookup

FKIE_CVE-2025-68794

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-04-15 00:35

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: iomap: adjust read range correctly for non-block-aligned positions iomap_adjust_read_range() assumes that the position and length passed in are block-aligned. This is not always the case however, as shown in the syzbot generated case for erofs. This causes too many bytes to be skipped for uptodate blocks, which results in returning the incorrect position and length to read in. If all the blocks are uptodate, this underflows length and returns a position beyond the folio. Fix the calculation to also take into account the block offset when calculating how many bytes can be skipped for uptodate blocks.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: adjust read range correctly for non-block-aligned positions\n\niomap_adjust_read_range() assumes that the position and length passed in\nare block-aligned. This is not always the case however, as shown in the\nsyzbot generated case for erofs. This causes too many bytes to be\nskipped for uptodate blocks, which results in returning the incorrect\nposition and length to read in. If all the blocks are uptodate, this\nunderflows length and returns a position beyond the folio.\n\nFix the calculation to also take into account the block offset when\ncalculating how many bytes can be skipped for uptodate blocks."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niomap: ajustar el rango de lectura correctamente para posiciones no alineadas a bloques\n\niomap_adjust_read_range() asume que la posici\u00f3n y la longitud pasadas est\u00e1n alineadas a bloques. Sin embargo, este no siempre es el caso, como se muestra en el caso generado por syzbot para erofs. Esto causa que se salten demasiados bytes para bloques actualizados, lo que resulta en la devoluci\u00f3n de una posici\u00f3n y longitud incorrectas para leer. Si todos los bloques est\u00e1n actualizados, esto provoca un desbordamiento negativo de la longitud y devuelve una posici\u00f3n m\u00e1s all\u00e1 del folio.\n\nCorregir el c\u00e1lculo para tambi\u00e9n tener en cuenta el desplazamiento del bloque al calcular cu\u00e1ntos bytes pueden ser saltados para bloques actualizados."
    }
  ],
  "id": "CVE-2025-68794",
  "lastModified": "2026-04-15T00:35:42.020",
  "metrics": {},
  "published": "2026-01-13T16:16:01.310",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-68794 (GCVE-0-2025-68794)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-05-11 21:53

Title

iomap: adjust read range correctly for non-block-aligned positions

Summary

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/82b60ffbb532d9199…
https://git.kernel.org/stable/c/12053695c8ef5410e…
https://git.kernel.org/stable/c/142194fb21afe964d…
https://git.kernel.org/stable/c/7aa6bc3e876699082…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9dc55f1389f9569acf9659e58dd836a9c70df217 , < 82b60ffbb532d919959702768dca04c3c0500ae5 (git) Affected: 9dc55f1389f9569acf9659e58dd836a9c70df217 , < 12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e (git) Affected: 9dc55f1389f9569acf9659e58dd836a9c70df217 , < 142194fb21afe964d2d194cab1fc357cbf87e899 (git) Affected: 9dc55f1389f9569acf9659e58dd836a9c70df217 , < 7aa6bc3e8766990824f66ca76c19596ce10daf3e (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 6.6.120 , ≤ 6.6.* (semver) Unaffected: 6.12.64 , ≤ 6.12.* (semver) Unaffected: 6.18.3 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/iomap/buffered-io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82b60ffbb532d919959702768dca04c3c0500ae5",
              "status": "affected",
              "version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
              "versionType": "git"
            },
            {
              "lessThan": "12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e",
              "status": "affected",
              "version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
              "versionType": "git"
            },
            {
              "lessThan": "142194fb21afe964d2d194cab1fc357cbf87e899",
              "status": "affected",
              "version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
              "versionType": "git"
            },
            {
              "lessThan": "7aa6bc3e8766990824f66ca76c19596ce10daf3e",
              "status": "affected",
              "version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/iomap/buffered-io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: adjust read range correctly for non-block-aligned positions\n\niomap_adjust_read_range() assumes that the position and length passed in\nare block-aligned. This is not always the case however, as shown in the\nsyzbot generated case for erofs. This causes too many bytes to be\nskipped for uptodate blocks, which results in returning the incorrect\nposition and length to read in. If all the blocks are uptodate, this\nunderflows length and returns a position beyond the folio.\n\nFix the calculation to also take into account the block offset when\ncalculating how many bytes can be skipped for uptodate blocks."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:53:27.938Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5"
        },
        {
          "url": "https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899"
        },
        {
          "url": "https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e"
        }
      ],
      "title": "iomap: adjust read range correctly for non-block-aligned positions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68794",
    "datePublished": "2026-01-13T15:29:05.553Z",
    "dateReserved": "2025-12-24T10:30:51.037Z",
    "dateUpdated": "2026-05-11T21:53:27.938Z",
    "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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2025-68794

CVE-2025-68794 (GCVE-0-2025-68794)

Tags

Sightings

Nomenclature