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CVE-2023-54099

Estado: AplazadaSin puntuar—

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

fs: Protect reconfiguration of sb read-write from racing writes

The reconfigure / remount code takes a lot of effort to protect filesystem's reconfiguration code from racing writes on remounting read-only. However during remounting read-only filesystem to read-write mode userspace writes can start immediately once we clear SB_RDONLY flag.

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This is inconvenient for example for ext4 because we need to do some writes to the filesystem (such as preparation of quota files) before we can take userspace writes so we are clearing SB_RDONLY flag before we are fully ready to accept userpace writes and syzbot has found a way to exploit this [1]. Also as far as I'm reading the code the filesystem remount code was protected from racing writes in the legacy mount path by the mount's MNT_READONLY flag so this is relatively new problem. It is actually fairly easy to protect remount read-write from racing writes using sb->s_readonly_remount flag so let's just do that instead of having to workaround these races in the filesystem code.

[1] https://lore.kernel.org/all/00000000000006a0df05f6667499@google.com/T/

CVSS

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

Probabilidad de explotación (EPSS)

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 KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-54099",
  "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": "8d0347f6c3a9d4953ddd636a31c6584da082e084",
              "lessThan": "0336b42456e485fda1006b5b411e7372e20fbf03",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d0347f6c3a9d4953ddd636a31c6584da082e084",
              "lessThan": "7e4e87ec56aa6d008c64eab31b340a7c452b26cc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d0347f6c3a9d4953ddd636a31c6584da082e084",
              "lessThan": "0ccfe21949bc9f706a86ee7351b74375c0745757",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d0347f6c3a9d4953ddd636a31c6584da082e084",
              "lessThan": "295ef44a2abaf97d7a594b1d4c60d4be3738191f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d0347f6c3a9d4953ddd636a31c6584da082e084",
              "lessThan": "4abda85197ba5d695e6040d580b4b409ce0d3733",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d0347f6c3a9d4953ddd636a31c6584da082e084",
              "lessThan": "c541dce86c537714b6761a79a969c1623dfa222b",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/super.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.253",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.190",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.126",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.45",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.4.10",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/super.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-24T13:16:11.787",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0336b42456e485fda1006b5b411e7372e20fbf03",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0ccfe21949bc9f706a86ee7351b74375c0745757",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/295ef44a2abaf97d7a594b1d4c60d4be3738191f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4abda85197ba5d695e6040d580b4b409ce0d3733",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e4e87ec56aa6d008c64eab31b340a7c452b26cc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c541dce86c537714b6761a79a969c1623dfa222b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Protect reconfiguration of sb read-write from racing writes\n\nThe reconfigure / remount code takes a lot of effort to protect\nfilesystem's reconfiguration code from racing writes on remounting\nread-only. However during remounting read-only filesystem to read-write\nmode userspace writes can start immediately once we clear SB_RDONLY\nflag. This is inconvenient for example for ext4 because we need to do\nsome writes to the filesystem (such as preparation of quota files)\nbefore we can take userspace writes so we are clearing SB_RDONLY flag\nbefore we are fully ready to accept userpace writes and syzbot has found\na way to exploit this [1]. Also as far as I'm reading the code\nthe filesystem remount code was protected from racing writes in the\nlegacy mount path by the mount's MNT_READONLY flag so this is relatively\nnew problem. It is actually fairly easy to protect remount read-write\nfrom racing writes using sb->s_readonly_remount flag so let's just do\nthat instead of having to workaround these races in the filesystem code.\n\n[1] https://lore.kernel.org/all/00000000000006a0df05f6667499@google.com/T/"
    }
  ],
  "lastModified": "2026-06-17T06:46:48.077",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}