HighFix available
virtiofs: fix UAF on submount umount
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.260, 5.15.211, 6.1.177, 6.12.95, 6.18.37, 6.6.144, 7.0.14, 7.1.2
- CVEs
- CVE-2026-53381
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 01:40 UTC · Revision 1
Source evidence
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.
osv:CVE-2026-53381
Kernel
Fixed versions: 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 7.0.14, 7.1.2
Complete source record
{
"id": "ca23dba7c34e176b8755e499531427f4d3adbf732eee2660c21d82cfb3181653",
"url": "https://osv.dev/vulnerability/CVE-2026-53381",
"method": "structured",
"payload": {
"kind": "advisory",
"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.",
"evidence": "osv:CVE-2026-53381",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.260",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.211",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.177",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.144",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.95",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.37",
"evidence": "/affected/1/ranges"
},
{
"value": "7.0.14",
"evidence": "/affected/1/ranges"
},
{
"value": "7.1.2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2026-53381",
"aliases": [
"CVE-2026-53381"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "548e1f2bac1d4df91a6138f26bb4ab00323fd948"
},
{
"fixed": "607a1d4c42f649e6197567c0448fd9ebb316cd42"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "cfd1aa3e2b71f3327cb373c45a897c9028c62b35"
},
{
"fixed": "1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "83b375c6efef69b1066ad2d79601221e7892745a"
},
{
"fixed": "0b809199ff87c44487e516a725dd4be2185712ce"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "bfd17b6138df0122a95989457d8e18ce0b86165e"
},
{
"fixed": "2181a09ba980f142650fb053666350ead4471cfe"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "b26923512dbe57ae4917bafd31396d22a9d1691a"
},
{
"fixed": "97c4691653d145dcc699eca5d3aba3219a520f1f"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "26e5c67deb2e1f42a951f022fdf5b9f7eb747b01"
},
{
"fixed": "2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9"
},
{
"fixed": "39a2b95e008665c14f84e50ed411d898df7cd11b"
},
{
"fixed": "e09412a714bcd49375198427bb4aa005037a9d6f"
},
{
"fixed": "06b41351779e9289e8785694ade9042ae85e41ea"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "5.10.246"
},
{
"fixed": "5.10.260"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "5.15.196"
},
{
"fixed": "5.15.211"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.1.158"
},
{
"fixed": "6.1.177"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.6.115"
},
{
"fixed": "6.6.144"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.12.54"
},
{
"fixed": "6.12.95"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.17.4"
},
{
"fixed": "6.18"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "f19a1390af448d9e193c08e28ea5f727bf3c3049"
}
]
}
],
"versions": [
"v5.10.259",
"v5.10.258",
"v5.10.257",
"v5.10.256",
"v5.10.255",
"v5.10.254",
"v5.10.253",
"v5.10.252",
"v5.10.251",
"v5.10.250",
"v5.10.249",
"v5.10.248",
"v5.10.247",
"v5.10.246",
"v5.15.210",
"v5.15.209",
"v5.15.208",
"v5.15.207",
"v5.15.206",
"v5.15.205",
"v5.15.204",
"v5.15.203",
"v5.15.202",
"v5.15.201",
"v5.15.200",
"v5.15.199",
"v5.15.198",
"v5.15.197",
"v5.15.196",
"v6.1.176",
"v6.1.175",
"v6.1.174",
"v6.1.173",
"v6.1.172",
"v6.1.171",
"v6.1.170",
"v6.1.169",
"v6.1.168",
"v6.1.167",
"v6.1.166",
"v6.1.165",
"v6.1.164",
"v6.1.163",
"v6.1.162",
"v6.1.161",
"v6.1.160",
"v6.1.159",
"v6.1.158",
"v6.6.143",
"v6.6.142",
"v6.6.141",
"v6.6.140",
"v6.6.139",
"v6.6.138",
"v6.6.137",
"v6.6.136",
"v6.6.135",
"v6.6.134",
"v6.6.133",
"v6.6.132",
"v6.6.131",
"v6.6.130",
"v6.6.129",
"v6.6.128",
"v6.6.127",
"v6.6.126",
"v6.6.125",
"v6.6.124",
"v6.6.123",
"v6.6.122",
"v6.6.121",
"v6.6.120",
"v6.6.119",
"v6.6.118",
"v6.6.117",
"v6.6.116",
"v6.6.115",
"v6.12.94",
"v6.12.93",
"v6.12.92",
"v6.12.91",
"v6.12.90",
"v6.12.89",
"v6.12.88",
"v6.12.87",
"v6.12.86",
"v6.12.85",
"v6.12.84",
"v6.12.83",
"v6.12.82",
"v6.12.81",
"v6.12.80",
"v6.12.79",
"v6.12.78",
"v6.12.77",
"v6.12.76",
"v6.12.75",
"v6.12.74",
"v6.12.73",
"v6.12.72",
"v6.12.71",
"v6.12.70",
"v6.12.69",
"v6.12.68",
"v6.12.67",
"v6.12.66",
"v6.12.65",
"v6.12.64",
"v6.12.63",
"v6.12.62",
"v6.12.61",
"v6.12.60",
"v6.12.59",
"v6.12.58",
"v6.12.57",
"v6.12.56",
"v6.12.55",
"v6.12.54",
"v6.17.13",
"v6.17.12",
"v6.17.11",
"v6.17.10",
"v6.17.9",
"v6.17.8",
"v6.17.7",
"v6.17.6",
"v6.17.5",
"v6.17.4"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53381.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.10.260"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.211"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.177"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.144"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.95"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.37"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.18.0"
},
{
"fixed": "7.0.14"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.1.2"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53381.json"
}
}
],
"modified": "2026-10-28T02:30:45.825174138Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea",
"https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce",
"https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e",
"https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe",
"https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9",
"https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b",
"https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42",
"https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f",
"https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53381.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53381",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53381.json"
}
},
"related_cves": [
{
"value": "CVE-2026-53381",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 513949,
"published_at": "2026-07-19T11:59:30.469+00:00"
}