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

Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-08-05 12:35
VLAI
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
References
Impacted 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)
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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-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "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."
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              "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."
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        "shortName": "Linux"
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      "title": "virtiofs: fix UAF on submount umount",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53381",
    "datePublished": "2026-07-19T11:59:30.469Z",
    "dateReserved": "2026-06-09T07:44:35.401Z",
    "dateUpdated": "2026-08-05T12:35:21.826Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-53381",
      "date": "2026-08-11",
      "epss": "0.00139",
      "percentile": "0.03687"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:47:10.000Z",
      "cve": "CVE-2026-53381",
      "id": "msrc_CVE-2026-53381",
      "initial_release_date": "2026-07-20T01:08:22.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "virtiofs: fix UAF on submount umount",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53381.json",
      "version": "2"
    },
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/fuse/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"548e1f2bac1d4df91a6138f26bb4ab00323fd948\",\"lessThan\":\"607a1d4c42f649e6197567c0448fd9ebb316cd42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cfd1aa3e2b71f3327cb373c45a897c9028c62b35\",\"lessThan\":\"1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83b375c6efef69b1066ad2d79601221e7892745a\",\"lessThan\":\"0b809199ff87c44487e516a725dd4be2185712ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bfd17b6138df0122a95989457d8e18ce0b86165e\",\"lessThan\":\"2181a09ba980f142650fb053666350ead4471cfe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b26923512dbe57ae4917bafd31396d22a9d1691a\",\"lessThan\":\"97c4691653d145dcc699eca5d3aba3219a520f1f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26e5c67deb2e1f42a951f022fdf5b9f7eb747b01\",\"lessThan\":\"2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26e5c67deb2e1f42a951f022fdf5b9f7eb747b01\",\"lessThan\":\"39a2b95e008665c14f84e50ed411d898df7cd11b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26e5c67deb2e1f42a951f022fdf5b9f7eb747b01\",\"lessThan\":\"e09412a714bcd49375198427bb4aa005037a9d6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26e5c67deb2e1f42a951f022fdf5b9f7eb747b01\",\"lessThan\":\"06b41351779e9289e8785694ade9042ae85e41ea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f19a1390af448d9e193c08e28ea5f727bf3c3049\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.246\",\"lessThan\":\"5.10.260\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.196\",\"lessThan\":\"5.15.211\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.158\",\"lessThan\":\"6.1.177\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.115\",\"lessThan\":\"6.6.144\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.54\",\"lessThan\":\"6.12.95\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.17.4\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/fuse/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.37\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.14\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.2\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.246\",\"versionEndExcluding\":\"5.10.260\",\"matchCriteriaId\":\"DECE3E82-AA55-4F8C-BD24-873FEE847389\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.196\",\"versionEndExcluding\":\"5.15.211\",\"matchCriter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    "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": "2026-08-03T23:34:23Z",
      "cve": "CVE-2026-53381",
      "id": "CVE-2026-53381",
      "initial_release_date": "2026-07-19T17:36:16Z",
      "product_status:known_affected": "251",
      "product_status:known_not_affected": "33",
      "product_status:recommended": "4",
      "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": "4"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.