CVE-2026-53381

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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."}], "metrics": [{"cvssV3_1": {"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"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fuse/file.c"], "versions": [{"version": "548e1f2bac1d4df91a6138f26bb4ab00323fd948", "lessThan": "607a1d4c42f649e6197567c0448fd9ebb316cd42", "status": "affected", "versionType": "git"}, {"version": "cfd1aa3e2b71f3327cb373c45a897c9028c62b35", "lessThan": "1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e", "status": "affected", "versionType": "git"}, {"version": "83b375c6efef69b1066ad2d79601221e7892745a", "lessThan": "0b809199ff87c44487e516a725dd4be2185712ce", "status": "affected", "versionType": "git"}, {"version": "bfd17b6138df0122a95989457d8e18ce0b86165e", "lessThan": "2181a09ba980f142650fb053666350ead4471cfe", "status": "affected", "versionType": "git"}, {"version": "b26923512dbe57ae4917bafd31396d22a9d1691a", "lessThan": "97c4691653d145dcc699eca5d3aba3219a520f1f", "status": "affected", "versionType": "git"}, {"version": "26e5c67deb2e1f42a951f022fdf5b9f7eb747b01", "lessThan": "2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9", "status": "affected", "versionType": "git"}, {"version": "26e5c67deb2e1f42a951f022fdf5b9f7eb747b01", "lessThan": "39a2b95e008665c14f84e50ed411d898df7cd11b", "status": "affected", "versionType": "git"}, {"version": "26e5c67deb2e1f42a951f022fdf5b9f7eb747b01", "lessThan": "e09412a714bcd49375198427bb4aa005037a9d6f", "status": "affected", "versionType": "git"}, {"version": "26e5c67deb2e1f42a951f022fdf5b9f7eb747b01", "lessThan": "06b41351779e9289e8785694ade9042ae85e41ea", "status": "affected", "versionType": "git"}, {"version": "f19a1390af448d9e193c08e28ea5f727bf3c3049", "status": "affected", "versionType": "git"}, {"version": "5.10.246", "lessThan": "5.10.260", "status": "affected", "versionType": "semver"}, {"version": "5.15.196", "lessThan": "5.15.211", "status": "affected", "versionType": "semver"}, {"version": "6.1.158", "lessThan": "6.1.177", "status": "affected", "versionType": "semver"}, {"version": "6.6.115", "lessThan": "6.6.144", "status": "affected", "versionType": "semver"}, {"version": "6.12.54", "lessThan": "6.12.95", "status": "affected", "versionType": "semver"}, {"version": "6.17.4", "lessThan": "6.18", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fuse/file.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.260", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.211", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.177", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.37", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.14", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.2", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.246", "versionEndExcluding": "5.10.260"}, {"vulnerable": true, "criteria": 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"versionEndExcluding": "7.1.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.4"}]}]}], "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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53381", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:29:49.943123Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:45.399Z"}}]}}

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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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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": 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"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"}], "programFiles": ["fs/fuse/file.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"status": "unaffected", "version": "0", "lessThan": "6.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.260", "versionType": "semver", "lessThanOrEqual": 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{"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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.260", "versionStartIncluding": "5.10.246"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.211", "versionStartIncluding": "5.15.196"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.177", "versionStartIncluding": "6.1.158"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.144", "versionStartIncluding": "6.6.115"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.95", "versionStartIncluding": "6.12.54"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.37", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.14", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.2", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.17.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:50:31.586Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53381", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:07:45.399Z", "dateReserved": "2026-06-09T07:44:35.401Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T11:59:30.469Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"matchCriteriaId": "6241DF06-E6F3-4B61-B5A2-A60F2AE5B982", "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": "2026-10-19T20:19:17.280", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53381", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:29:49.943123Z", "version": "2.0.3"}}]}, "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": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: virtiofs: fix UAF on submount umount", "id": "2502204", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502204"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvirtiofs: fix UAF on submount umount\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.\nThis only works, however, for the last submount instance, as the wait\ncounter is per connection, not per superblock.\nRevert to using synchronous release requests for the auto_submounts case,\nwhich is virtiofs only at this time.", "A flaw was found in the virtiofs component of the Linux kernel. A use-after-free (UAF) vulnerability exists during submount unmount operations. This occurs because the `iput()` function, called from `fuse_release_end()`, can attempt to access a super block that has already been destroyed. This can lead to a kernel panic, resulting in a denial of service."], "name": "CVE-2026-53381", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53381\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53381\nhttps://lore.kernel.org/linux-cve-announce/2026071931-CVE-2026-53381-73c3@gregkh/T"], "threat_severity": "Moderate"}

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