ghsa-g3v4-6rhh-7539
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-12-30 21:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47254"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:14Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-g3v4-6rhh-7539",
  "modified": "2024-12-30T21:30:46Z",
  "published": "2024-05-21T15:31:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47254"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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