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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
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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This function then sets the appropriate values, like\\nthe offset.\\n\\nloop_device has lo_offset of type loff_t (see line 52 of loop.c),\\nwhich is typdef-chained to long long, whereas loop_info64 has\\nlo_offset of type __u64 (see line 56 of include/uapi/linux/loop.h).\\n\\nThe function directly copies offset from info to the device as\\nfollows (See line 980 of loop.c):\\n\\tlo-\u003elo_offset = info-\u003elo_offset;\\n\\nThis results in an overflow, which triggers a warning in iomap_iter()\\ndue to a call to iomap_iter_done() which has:\\n\\tWARN_ON_ONCE(iter-\u003eiomap.offset \u003e iter-\u003epos);\\n\\nThus, check for negative value during loop_set_status_from_info().\\n\\nBug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e\"},{\"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). 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Informe de error: 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    "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": "2026-09-01T01:25:42Z",
      "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": "186",
      "product_status:recommended": "337",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49993",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49993.json",
      "version": "55"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.