CVE-2026-53381 (GCVE-0-2026-53381)
Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-08-17 04:50
VLAI
EPSS
VEX
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)
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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) |
guessed |
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"versionEndExcluding": "7.0.14",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C18FAA06-B61A-4036-A12D-F06F5135E64B",
"versionEndExcluding": "7.1.2",
"versionStartIncluding": "7.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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": "CVE-2026-53381",
"lastModified": "2026-08-17T05:17:11.917",
"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"
}
]
},
"published": "2026-07-19T12:16:48.807",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-20T17:09:22+00:00",
"cve": "CVE-2026-53381",
"id": "CVE-2026-53381",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: virtiofs: fix UAF on submount umount",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53381.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-18T00:50:59Z",
"cve": "CVE-2026-53381",
"id": "CVE-2026-53381",
"initial_release_date": "2026-07-19T17:36:16Z",
"product_status:first_fixed": "106",
"product_status:known_affected": "643",
"product_status:known_not_affected": "61",
"product_status:recommended": "256",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-53381",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53381.json",
"version": "16"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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