Vulnerability-Lookup

GHSA-525M-F6H4-6W58

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

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": [
      "CWE-416"
    ],
    "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"
    }
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  "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"
    }
  ]
}

CVE-2026-53381 (GCVE-0-2026-53381)

Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-08-17 04:50

Title

virtiofs: fix UAF on submount umount

Summary

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

Assigner

Linux mitre root Scorecard

References

9 references

URL	Tags
https://git.kernel.org/stable/c/607a1d4c42f649e61…
https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa…
https://git.kernel.org/stable/c/0b809199ff87c4448…
https://git.kernel.org/stable/c/2181a09ba980f1426…
https://git.kernel.org/stable/c/97c4691653d145dcc…
https://git.kernel.org/stable/c/2abfd3ffbd9452f72…
https://git.kernel.org/stable/c/39a2b95e008665c14…
https://git.kernel.org/stable/c/e09412a714bcd4937…
https://git.kernel.org/stable/c/06b41351779e9289e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 548e1f2bac1d4df91a6138f26bb4ab00323fd948 , < 607a1d4c42f649e6197567c0448fd9ebb316cd42 (git) Affected: cfd1aa3e2b71f3327cb373c45a897c9028c62b35 , < 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e (git) Affected: 83b375c6efef69b1066ad2d79601221e7892745a , < 0b809199ff87c44487e516a725dd4be2185712ce (git) Affected: bfd17b6138df0122a95989457d8e18ce0b86165e , < 2181a09ba980f142650fb053666350ead4471cfe (git) Affected: b26923512dbe57ae4917bafd31396d22a9d1691a , < 97c4691653d145dcc699eca5d3aba3219a520f1f (git) Affected: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 , < 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 (git) Affected: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 , < 39a2b95e008665c14f84e50ed411d898df7cd11b (git) Affected: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 , < e09412a714bcd49375198427bb4aa005037a9d6f (git) Affected: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 , < 06b41351779e9289e8785694ade9042ae85e41ea (git) Affected: f19a1390af448d9e193c08e28ea5f727bf3c3049 (git) Affected: 5.10.246 , < 5.10.260 (semver) Affected: 5.15.196 , < 5.15.211 (semver) Affected: 6.1.158 , < 6.1.177 (semver) Affected: 6.6.115 , < 6.6.144 (semver) Affected: 6.12.54 , < 6.12.95 (semver) Affected: 6.17.4 , < 6.18 (semver)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 5.10.260 , ≤ 5.10.* (semver) Unaffected: 5.15.211 , ≤ 5.15.* (semver) Unaffected: 6.1.177 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.37 , ≤ 6.18.* (semver) Unaffected: 7.0.14 , ≤ 7.0.* (semver) Unaffected: 7.1.2 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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    "dateReserved": "2026-06-09T07:44:35.401Z",
    "dateUpdated": "2026-08-17T04:50:31.586Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-525M-F6H4-6W58

CVE-2026-53381 (GCVE-0-2026-53381)

Tags

Sightings

Nomenclature

Related by attack behaviour