CVE-2023-53791

Estado: AplazadaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

md: fix warning for holder mismatch from export_rdev()

Commit a1d767191096 ("md: use mddev->external to select holder in export_rdev()") fix the problem that 'claim_rdev' is used for blkdev_get_by_dev() while 'rdev' is used for blkdev_put().

However, if mddev->external is changed from 0 to 1, then 'rdev' is used for blkdev_get_by_dev() while 'claim_rdev' is used for blkdev_put(). And this problem can be reporduced reliably by following:

New file: mdadm/tests/23rdev-lifetime

devname=${dev0##*/} devt=`cat /sys/block/$devname/dev` pid="" runtime=2

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trap 'clean_up_test' EXIT

echo md0 > /sys/module/md_mod/parameters/new_array || die "create md0 failed"

add_by_sysfs & pid="$pid $!"

remove_by_sysfs & pid="$pid $!"

sleep $runtime exit 0

Test cmd:

./test --save-logs --logdir=/tmp/ --keep-going --dev=loop --tests=23rdev-lifetime

Test result:

Fix the problem by recording if 'rdev' is used as holder.

Detalles técnicos trazas, registros y código del informe original

clean_up_test() {
        pill -9 $pid
        echo clear > /sys/block/md0/md/array_state
}

add_by_sysfs() {
        while true; do
                echo $devt > /sys/block/md0/md/new_dev
        done
}

remove_by_sysfs(){
        while true; do
                echo remove > /sys/block/md0/md/dev-${devname}/state
        done
}

------------[ cut here ]------------
WARNING: CPU: 0 PID: 960 at block/bdev.c:618 blkdev_put+0x27c/0x330
Modules linked in: multipath md_mod loop
CPU: 0 PID: 960 Comm: test Not tainted 6.5.0-rc2-00121-g01e55c376936-dirty #50
RIP: 0010:blkdev_put+0x27c/0x330
Call Trace:
 <TASK>
 export_rdev.isra.23+0x50/0xa0 [md_mod]
 mddev_unlock+0x19d/0x300 [md_mod]
 rdev_attr_store+0xec/0x190 [md_mod]
 sysfs_kf_write+0x52/0x70
 kernfs_fop_write_iter+0x19a/0x2a0
 vfs_write+0x3b5/0x770
 ksys_write+0x74/0x150
 __x64_sys_write+0x22/0x30
 do_syscall_64+0x40/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 7
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2023-53791",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "a1d7671910965ca9f8f0377e7e3bfd1179fba4d8",
              "lessThan": "99fcd427178d0f58f5520f8f01df727f8eaeb2c7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a1d7671910965ca9f8f0377e7e3bfd1179fba4d8",
              "lessThan": "99892147f028d711f9d40fefad4f33632593864c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/md/md.c",
            "drivers/md/md.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.5",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.5.5",
              "versionType": "semver",
              "lessThanOrEqual": "6.5.*"
            },
            {
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/md/md.c",
            "drivers/md/md.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-09T01:16:50.570",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/99892147f028d711f9d40fefad4f33632593864c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/99fcd427178d0f58f5520f8f01df727f8eaeb2c7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix warning for holder mismatch from export_rdev()\n\nCommit a1d767191096 (\"md: use mddev->external to select holder in\nexport_rdev()\") fix the problem that 'claim_rdev' is used for\nblkdev_get_by_dev() while 'rdev' is used for blkdev_put().\n\nHowever, if mddev->external is changed from 0 to 1, then 'rdev' is used\nfor blkdev_get_by_dev() while 'claim_rdev' is used for blkdev_put(). And\nthis problem can be reporduced reliably by following:\n\nNew file: mdadm/tests/23rdev-lifetime\n\ndevname=${dev0##*/}\ndevt=`cat /sys/block/$devname/dev`\npid=\"\"\nruntime=2\n\nclean_up_test() {\n        pill -9 $pid\n        echo clear > /sys/block/md0/md/array_state\n}\n\ntrap 'clean_up_test' EXIT\n\nadd_by_sysfs() {\n        while true; do\n                echo $devt > /sys/block/md0/md/new_dev\n        done\n}\n\nremove_by_sysfs(){\n        while true; do\n                echo remove > /sys/block/md0/md/dev-${devname}/state\n        done\n}\n\necho md0 > /sys/module/md_mod/parameters/new_array || die \"create md0 failed\"\n\nadd_by_sysfs &\npid=\"$pid $!\"\n\nremove_by_sysfs &\npid=\"$pid $!\"\n\nsleep $runtime\nexit 0\n\nTest cmd:\n\n./test --save-logs --logdir=/tmp/ --keep-going --dev=loop --tests=23rdev-lifetime\n\nTest result:\n\n------------[ cut here ]------------\nWARNING: CPU: 0 PID: 960 at block/bdev.c:618 blkdev_put+0x27c/0x330\nModules linked in: multipath md_mod loop\nCPU: 0 PID: 960 Comm: test Not tainted 6.5.0-rc2-00121-g01e55c376936-dirty #50\nRIP: 0010:blkdev_put+0x27c/0x330\nCall Trace:\n <TASK>\n export_rdev.isra.23+0x50/0xa0 [md_mod]\n mddev_unlock+0x19d/0x300 [md_mod]\n rdev_attr_store+0xec/0x190 [md_mod]\n sysfs_kf_write+0x52/0x70\n kernfs_fop_write_iter+0x19a/0x2a0\n vfs_write+0x3b5/0x770\n ksys_write+0x74/0x150\n __x64_sys_write+0x22/0x30\n do_syscall_64+0x40/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFix the problem by recording if 'rdev' is used as holder."
    }
  ],
  "lastModified": "2026-06-17T06:46:04.800",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}