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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Check for overflow while configuring loop\n\nThe userspace can configure a loop using an ioctl call, wherein\na configuration of type loop_config is passed (see lo_ioctl()\u0027s\ncase on line 1550 of drivers/block/loop.c). This proceeds to call\nloop_configure() which in turn calls loop_set_status_from_info()\n(see line 1050 of loop.c), passing \u0026config-\u003einfo which is of type\nloop_info64*. 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"
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    "cveId": "CVE-2022-49993",
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    "dateReserved": "2025-06-18T10:57:27.387Z",
    "dateUpdated": "2026-05-11T19:10:39.147Z",
    "state": "PUBLISHED"
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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: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.9.327\",\"matchCriteriaId\":\"3433BB10-41AC-4CF0-B19A-0EC09FF26272\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.292\",\"matchCriteriaId\":\"42DF7D19-F259-47AF-8715-288480443B27\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.312\",\"matchCriteriaId\":\"F57B6605-AFC4-47EE-A540-51CE83AD4EC9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.274\",\"matchCriteriaId\":\"F45A0F3C-C16D-49C4-86D6-D021C3D4B834\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.140\",\"matchCriteriaId\":\"A26216A8-920B-4892-A1EB-143451AFFC31\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.64\",\"matchCriteriaId\":\"292F3687-ADC2-4F3D-9710-3BCAD11A52BE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.19.6\",\"matchCriteriaId\":\"89E99903-E16D-475D-954B-2BAC46C98262\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E8BD11A3-8643-49B6-BADE-5029A0117325\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5F0AD220-F6A9-4012-8636-155F1B841FAD\"}]}]}],\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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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.

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  • 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.
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