CVE-2026-53381 (GCVE-0-2026-53381)
Vulnerability from cvelistv5
Published
2026-07-19 11:59
Modified
2026-08-17 04:50
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 548e1f2bac1d4df91a6138f26bb4ab00323fd948 Version: cfd1aa3e2b71f3327cb373c45a897c9028c62b35 Version: 83b375c6efef69b1066ad2d79601221e7892745a Version: bfd17b6138df0122a95989457d8e18ce0b86165e Version: b26923512dbe57ae4917bafd31396d22a9d1691a Version: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 Version: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 Version: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 Version: 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 Version: f19a1390af448d9e193c08e28ea5f727bf3c3049 Version: 5.10.246 ≤ Version: 5.15.196 ≤ Version: 6.1.158 ≤ Version: 6.6.115 ≤ Version: 6.12.54 ≤ Version: 6.17.4 ≤ |
||
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"fs/fuse/file.c"
],
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"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "548e1f2bac1d4df91a6138f26bb4ab00323fd948",
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},
{
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"versionType": "git"
},
{
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{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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},
{
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"status": "affected",
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"versionType": "git"
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{
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"versionType": "git"
},
{
"lessThan": "5.10.260",
"status": "affected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThan": "5.15.211",
"status": "affected",
"version": "5.15.196",
"versionType": "semver"
},
{
"lessThan": "6.1.177",
"status": "affected",
"version": "6.1.158",
"versionType": "semver"
},
{
"lessThan": "6.6.144",
"status": "affected",
"version": "6.6.115",
"versionType": "semver"
},
{
"lessThan": "6.12.95",
"status": "affected",
"version": "6.12.54",
"versionType": "semver"
},
{
"lessThan": "6.18",
"status": "affected",
"version": "6.17.4",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.18"
},
{
"lessThan": "6.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.37",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.14",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.260",
"versionStartIncluding": "5.10.246",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.211",
"versionStartIncluding": "5.15.196",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.158",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.144",
"versionStartIncluding": "6.6.115",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.95",
"versionStartIncluding": "6.12.54",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.37",
"versionStartIncluding": "6.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.14",
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},
{
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"vulnerable": true
},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.17.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached through local VFS operations (open/write/close) on a virtiofs mount with FUSE submounts; exploitation is in the guest FUSE client during file release and submount umount, not via remote network packets.\nAC:L - This is a use-after-free where the attacker controls file close (async FUSE RELEASE) and can drive or coincide with submount umount; Kata Containers reproduces it reliably with virtiofsd --announce-submounts (default).\nPR:L - An unprivileged local process with access to the virtiofs mount can trigger it; virtiofs defaults to allow_other and normal POSIX permissions, and no real root or init-namespace capabilities are required.\nUI:N - Exploitation needs no victim interaction beyond the attacker (or their container workload) performing normal filesystem I/O while submount teardown occurs during pod/container lifecycle.\nS:U - Impact stays within the guest kernel security boundary (crash or guest kernel compromise); it does not by itself cross a VM/host or IOMMU boundary.\nC:H - The flaw is a use-after-free in fuse_release_end() calling iput() on an inode after its superblock is destroyed, which can be turned into arbitrary kernel memory read via heap manipulation.\nI:H - Use-after-free on a struct inode in the kernel heap provides a standard path to controlled memory corruption, heap spraying, and arbitrary write or code execution in kernel context.\nA:H - Confirmed kernel general protection fault/oops in iput() from fuse_release_end during virtio_fs request completion, and UAF bugs inherently threaten kernel stability even without full exploitation."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:50:31.586Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42"
},
{
"url": "https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e"
},
{
"url": "https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce"
},
{
"url": "https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe"
},
{
"url": "https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f"
},
{
"url": "https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9"
},
{
"url": "https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b"
},
{
"url": "https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f"
},
{
"url": "https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea"
}
],
"title": "virtiofs: fix UAF on submount umount",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-53381",
"datePublished": "2026-07-19T11:59:30.469Z",
"dateReserved": "2026-06-09T07:44:35.401Z",
"dateUpdated": "2026-08-17T04:50:31.586Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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