GHSA-525M-F6H4-6W58

Vulnerability from github – Published: 2026-07-19 12:30 – Updated: 2026-07-20 15:31
VLAI
Details

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

virtiofs: fix UAF on submount umount

iput() called from fuse_release_end() can Oops if the super block has already been destroyed. Normally this is prevented by waiting for num_waiting to go down to zero before commencing with super block shutdown.

This only works, however, for the last submount instance, as the wait counter is per connection, not per superblock.

Revert to using synchronous release requests for the auto_submounts case, which is virtiofs only at this time.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-53381"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T12:16:48Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtiofs: fix UAF on submount umount\n\niput() called from fuse_release_end() can Oops if the super block has\nalready been destroyed.  Normally this is prevented by waiting for\nnum_waiting to go down to zero before commencing with super block shutdown.\n\nThis only works, however, for the last submount instance, as the wait\ncounter is per connection, not per superblock.\n\nRevert to using synchronous release requests for the auto_submounts case,\nwhich is virtiofs only at this time.",
  "id": "GHSA-525m-f6h4-6w58",
  "modified": "2026-07-20T15:31:44Z",
  "published": "2026-07-19T12:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53381"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f"
    }
  ],
  "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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