CVE-2022-49993 (GCVE-0-2022-49993)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-05-11 19:10
VLAI
Title
loop: Check for overflow while configuring loop
Summary
In the Linux kernel, the following vulnerability has been resolved: loop: Check for overflow while configuring loop The userspace can configure a loop using an ioctl call, wherein a configuration of type loop_config is passed (see lo_ioctl()'s case on line 1550 of drivers/block/loop.c). This proceeds to call loop_configure() which in turn calls loop_set_status_from_info() (see line 1050 of loop.c), passing &config->info which is of type loop_info64*. This function then sets the appropriate values, like the offset. loop_device has lo_offset of type loff_t (see line 52 of loop.c), which is typdef-chained to long long, whereas loop_info64 has lo_offset of type __u64 (see line 56 of include/uapi/linux/loop.h). The function directly copies offset from info to the device as follows (See line 980 of loop.c): lo->lo_offset = info->lo_offset; This results in an overflow, which triggers a warning in iomap_iter() due to a call to iomap_iter_done() which has: WARN_ON_ONCE(iter->iomap.offset > iter->pos); Thus, check for negative value during loop_set_status_from_info(). Bug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 18e28817cb516b39de6281f6db9b0618b2cc7b42 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < adf0112d9b8acb03485624220b4934f69bf13369 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a217715338fd48f72114725aa7a40e484a781ca7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b40877b8562c5720d0a7fce20729f56b75a3dede (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6858933131d0dadac071c4d33335a9ea4b8e76cf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0455bef69028c65065f16bb04635591b2374249b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9be7fa7ead18a48940df7b59d993bbc8b9055c15 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c490a0b5a4f36da3918181a8acdc6991d967c5f3 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.9.327 , ≤ 4.9.* (semver)
Unaffected: 4.14.292 , ≤ 4.14.* (semver)
Unaffected: 4.19.312 , ≤ 4.19.* (semver)
Unaffected: 5.4.274 , ≤ 5.4.* (semver)
Unaffected: 5.10.140 , ≤ 5.10.* (semver)
Unaffected: 5.15.64 , ≤ 5.15.* (semver)
Unaffected: 5.19.6 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: loop: Comprobar si hay desbordamiento al configurar loop El espacio de usuario puede configurar un bucle mediante una llamada ioctl, en la que se pasa una configuraci\u00f3n de tipo loop_config (consulte el caso de lo_ioctl() en la l\u00ednea 1550 de drivers/block/loop.c). Esto procede a llamar a loop_configure() que a su vez llama a loop_set_status_from_info() (consulte la l\u00ednea 1050 de loop.c), pasando \u0026amp;config-\u0026gt;info que es de tipo loop_info64*. Esta funci\u00f3n luego establece los valores apropiados, como el desplazamiento. loop_device tiene lo_offset de tipo loff_t (consulte la l\u00ednea 52 de loop.c), que est\u00e1 encadenado por typdef a long long, mientras que loop_info64 tiene lo_offset de tipo __u64 (consulte la l\u00ednea 56 de include/uapi/linux/loop.h). La funci\u00f3n copia directamente el desplazamiento de info al dispositivo como se indica a continuaci\u00f3n (v\u00e9ase la l\u00ednea 980 de loop.c): lo-\u0026gt;lo_offset = info-\u0026gt;lo_offset; Esto genera un desbordamiento que genera una advertencia en iomap_iter() debido a una llamada a iomap_iter_done() que tiene: WARN_ON_ONCE(iter-\u0026gt;iomap.offset \u0026gt; iter-\u0026gt;pos); Por lo tanto, se debe verificar si hay un valor negativo durante loop_set_status_from_info(). Informe de error: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e"
          }
        ],
        "id": "CVE-2022-49993",
        "lastModified": "2026-06-17T05:19:42.167",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-06-18T11:15:26.977",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:34:38+00:00",
      "cve": "CVE-2022-49993",
      "id": "CVE-2022-49993",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "201",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: loop: Check for overflow while configuring loop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49993.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-21T00:49:54Z",
      "cve": "CVE-2022-49993",
      "id": "CVE-2022-49993",
      "initial_release_date": "2025-06-19T03:44:34Z",
      "product_status:known_affected": "501",
      "product_status:known_not_affected": "183",
      "product_status:recommended": "364",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49993",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2022-49993.json",
      "version": "60"
    }
  }
}



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Nomenclature

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