fkie_cve-2025-21832
Vulnerability from fkie_nvd
Published
2025-03-06 17:15
Modified
2025-11-03 21:19
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: block: don't revert iter for -EIOCBQUEUED blkdev_read_iter() has a few odd checks, like gating the position and count adjustment on whether or not the result is bigger-than-or-equal to zero (where bigger than makes more sense), and not checking the return value of blkdev_direct_IO() before doing an iov_iter_revert(). The latter can lead to attempting to revert with a negative value, which when passed to iov_iter_revert() as an unsigned value will lead to throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT. Be sane and don't revert for -EIOCBQUEUED, like what is done in other spots.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don\u0027t revert iter for -EIOCBQUEUED\n\nblkdev_read_iter() has a few odd checks, like gating the position and\ncount adjustment on whether or not the result is bigger-than-or-equal to\nzero (where bigger than makes more sense), and not checking the return\nvalue of blkdev_direct_IO() before doing an iov_iter_revert(). The\nlatter can lead to attempting to revert with a negative value, which\nwhen passed to iov_iter_revert() as an unsigned value will lead to\nthrowing a WARN_ON() because unroll is bigger than MAX_RW_COUNT.\n\nBe sane and don\u0027t revert for -EIOCBQUEUED, like what is done in other\nspots."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: no revertir iter para -EIOCBQUEUED blkdev_read_iter() tiene algunas comprobaciones extra\u00f1as, como bloquear el ajuste de posici\u00f3n y conteo en funci\u00f3n de si el resultado es o no mayor o igual a cero (donde mayor que tiene m\u00e1s sentido), y no verificar el valor de retorno de blkdev_direct_IO() antes de hacer un iov_iter_revert(). Esto \u00faltimo puede llevar a intentar revertir con un valor negativo, que cuando se pasa a iov_iter_revert() como un valor sin signo conducir\u00e1 a lanzar un WARN_ON() porque unroll es mayor que MAX_RW_COUNT. Sea sensato y no revierta para -EIOCBQUEUED, como lo que se hace en otros lugares."
    }
  ],
  "id": "CVE-2025-21832",
  "lastModified": "2025-11-03T21:19:13.457",
  "metrics": {
    "cvssMetricV31": [
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        "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-03-06T17:15:23.177",
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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