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FKIE_CVE-2021-47254

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2_glock_shrink_scan The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put(). On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list. Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
To clipboard 

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              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix use-after-free in gfs2_glock_shrink_scan\n\nThe GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to\nremove the glock from the lru list in __gfs2_glock_put().\n\nOn the shrink scan path, the same flag is cleared under lru_lock but because\nof cond_resched_lock(\u0026lru_lock) in gfs2_dispose_glock_lru(), progress on the\nput side can be made without deleting the glock from the lru list.\n\nKeep GLF_LRU across the race window opened by cond_resched_lock(\u0026lru_lock) to\nensure correct behavior on both sides - clear GLF_LRU after list_del under\nlru_lock."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gfs2: corrige use-after-free en gfs2_glock_shrink_scan. El indicador GLF_LRU se marca en lru_lock en gfs2_glock_remove_from_lru() para eliminar el glock de la lista lru en __gfs2_glock_put(). En la ruta de escaneo de reducci\u00f3n, la misma bandera se borra en lru_lock pero debido a cond_resched_lock(\u0026amp;lru_lock) en gfs2_dispose_glock_lru(), se puede avanzar en el lado de venta sin eliminar la glock de la lista de lru. Mantenga GLF_LRU en la ventana de ejecuci\u00f3n abierta por cond_resched_lock(\u0026amp;lru_lock) para garantizar un comportamiento correcto en ambos lados; borre GLF_LRU despu\u00e9s de list_del en lru_lock."
    }
  ],
  "id": "CVE-2021-47254",
  "lastModified": "2026-08-04T10:16:55.263",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47254",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-17T17:37:55.520472Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:14.233",
  "references": [
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      "url": "https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595"
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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