CVE-2026-98992

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98992", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.384Z", "datePublished": "2026-10-23T12:20:11.256Z", "dateUpdated": "2026-10-30T12:40:45.913Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:40:45.913Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnamespace: don't copy an unmounted mount tree\n\nmay_copy_tree() accepts a mount whose root is an nsfs or pidfs file\nbefore it checks whether that mount is mounted. This exception exists\nfor nsfs and pidfs mounts. They are part of no mount namespace so\nneither check_mnt() nor is_mounted() would let them through and\nbind-mounting a nsfsfd or a pidfd wouldn't work.\n\nProblem is that exception also admits a bind mount of such a file when\nit was lazily unmounted and is only kept alive by a file descriptor:\n\n mount --bind /proc/self/ns/net /tmp/x\n exec 3< /tmp/x\n umount -l /tmp/x\n mount --rbind /proc/self/fd/3 /tmp/y\n\nWith MS_REC or AT_RECURSIVE copy_tree() doesn't stop at the unmounted\nmount. It copies every mount that stayed attached to it as well. So if\nyou have a bunch of overmounts over the nsfsfd or the pidfd the whole\nunmounted stack is copied. That's a bug.\n\nSo refuse to walk an unmounted tree. Copying its root alone stays\npossible. So a bind mount of a namespace that is gone can still be\nrecreated from a file descriptor on the old one. The file descriptor\npins that mount and its root and __has_locked_children() only reads the\ndirect children which don't leave the parent's list without\nnamespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL\nand are still walked. Copying an unmounted tree recursively fails with\nEINVAL."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/namespace.c"], "versions": [{"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "94d05b62dc7aea236db20166e79ee002e466393a", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "07c6a8f004bcc58b4ccf993e6efa7b9b8b4a1b8b", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "31cf157298271392ab5fb0805b28d37c8d7a8057", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "86a2d56b1960720bf1844441c0890621e9db2f25", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "7e037b1fd339d865737c8accd29abcf40130a5a0", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "b47b40c4f058418f9707454543179df240796aad", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "8d3527457e183cedee3003c2897314da49488311", "status": "affected", "versionType": "git"}, {"version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "lessThan": "8bacbf6be959973b28b691713a872c12eae69eec", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/namespace.c"], "versions": [{"version": "3.19", "status": "affected"}, {"version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.11", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "3.19", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.2.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/94d05b62dc7aea236db20166e79ee002e466393a"}, {"url": "https://git.kernel.org/stable/c/07c6a8f004bcc58b4ccf993e6efa7b9b8b4a1b8b"}, {"url": "https://git.kernel.org/stable/c/31cf157298271392ab5fb0805b28d37c8d7a8057"}, {"url": "https://git.kernel.org/stable/c/86a2d56b1960720bf1844441c0890621e9db2f25"}, {"url": "https://git.kernel.org/stable/c/7e037b1fd339d865737c8accd29abcf40130a5a0"}, {"url": "https://git.kernel.org/stable/c/b47b40c4f058418f9707454543179df240796aad"}, {"url": "https://git.kernel.org/stable/c/8d3527457e183cedee3003c2897314da49488311"}, {"url": "https://git.kernel.org/stable/c/8bacbf6be959973b28b691713a872c12eae69eec"}], "title": "namespace: don't copy an unmounted mount tree", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/namespace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "94d05b62dc7aea236db20166e79ee002e466393a", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "07c6a8f004bcc58b4ccf993e6efa7b9b8b4a1b8b", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "31cf157298271392ab5fb0805b28d37c8d7a8057", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "86a2d56b1960720bf1844441c0890621e9db2f25", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "7e037b1fd339d865737c8accd29abcf40130a5a0", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "b47b40c4f058418f9707454543179df240796aad", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "8d3527457e183cedee3003c2897314da49488311", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}, {"lessThan": "8bacbf6be959973b28b691713a872c12eae69eec", "status": "affected", "version": "e149ed2b805fefdccf7ccdfc19eca22fdd4514ac", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/namespace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.19"}, {"lessThan": "3.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnamespace: don't copy an unmounted mount tree\n\nmay_copy_tree() accepts a mount whose root is an nsfs or pidfs file\nbefore it checks whether that mount is mounted. This exception exists\nfor nsfs and pidfs mounts. They are part of no mount namespace so\nneither check_mnt() nor is_mounted() would let them through and\nbind-mounting a nsfsfd or a pidfd wouldn't work.\n\nProblem is that exception also admits a bind mount of such a file when\nit was lazily unmounted and is only kept alive by a file descriptor:\n\n mount --bind /proc/self/ns/net /tmp/x\n exec 3< /tmp/x\n umount -l /tmp/x\n mount --rbind /proc/self/fd/3 /tmp/y\n\nWith MS_REC or AT_RECURSIVE copy_tree() doesn't stop at the unmounted\nmount. It copies every mount that stayed attached to it as well. So if\nyou have a bunch of overmounts over the nsfsfd or the pidfd the whole\nunmounted stack is copied. That's a bug.\n\nSo refuse to walk an unmounted tree. Copying its root alone stays\npossible. So a bind mount of a namespace that is gone can still be\nrecreated from a file descriptor on the old one. The file descriptor\npins that mount and its root and __has_locked_children() only reads the\ndirect children which don't leave the parent's list without\nnamespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL\nand are still walked. Copying an unmounted tree recursively fails with\nEINVAL."}], "id": "CVE-2026-98992", "lastModified": "2026-10-30T13:21:34.580", "metrics": {}, "published": "2026-10-23T13:17:21.283", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/07c6a8f004bcc58b4ccf993e6efa7b9b8b4a1b8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/31cf157298271392ab5fb0805b28d37c8d7a8057"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e037b1fd339d865737c8accd29abcf40130a5a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86a2d56b1960720bf1844441c0890621e9db2f25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8bacbf6be959973b28b691713a872c12eae69eec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8d3527457e183cedee3003c2897314da49488311"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/94d05b62dc7aea236db20166e79ee002e466393a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b47b40c4f058418f9707454543179df240796aad"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: namespace: don't copy an unmounted mount tree", "id": "2559797", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559797"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-552", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnamespace: don't copy an unmounted mount tree\nmay_copy_tree() accepts a mount whose root is an nsfs or pidfs file\nbefore it checks whether that mount is mounted. This exception exists\nfor nsfs and pidfs mounts. They are part of no mount namespace so\nneither check_mnt() nor is_mounted() would let them through and\nbind-mounting a nsfsfd or a pidfd wouldn't work.\nProblem is that exception also admits a bind mount of such a file when\nit was lazily unmounted and is only kept alive by a file descriptor:\nmount --bind /proc/self/ns/net /tmp/x\nexec 3< /tmp/x\numount -l /tmp/x\nmount --rbind /proc/self/fd/3 /tmp/y\nWith MS_REC or AT_RECURSIVE copy_tree() doesn't stop at the unmounted\nmount. It copies every mount that stayed attached to it as well. So if\nyou have a bunch of overmounts over the nsfsfd or the pidfd the whole\nunmounted stack is copied. That's a bug.\nSo refuse to walk an unmounted tree. Copying its root alone stays\npossible. So a bind mount of a namespace that is gone can still be\nrecreated from a file descriptor on the old one. The file descriptor\npins that mount and its root and __has_locked_children() only reads the\ndirect children which don't leave the parent's list without\nnamespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL\nand are still walked. Copying an unmounted tree recursively fails with\nEINVAL.", "A flaw was found in the Linux kernel. When performing a recursive bind mount on a lazily unmounted namespace or process file held open by a file descriptor, the kernel fails to verify that the mount tree is still active. A local user could exploit this vulnerability to duplicate and access unmounted filesystem trees, potentially bypassing intended mount boundaries or causing system instability."], "name": "CVE-2026-98992", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98992\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98992\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98992.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,86a2d56b1960720bf1844441c0890621e9db2f25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,7e037b1fd339d865737c8accd29abcf40130a5a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,b47b40c4f058418f9707454543179df240796aad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,8d3527457e183cedee3003c2897314da49488311)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,8bacbf6be959973b28b691713a872c12eae69eec)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.160,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.57,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.11,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,86a2d56b1960720bf1844441c0890621e9db2f25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,7e037b1fd339d865737c8accd29abcf40130a5a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,b47b40c4f058418f9707454543179df240796aad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,8d3527457e183cedee3003c2897314da49488311)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e149ed2b805fefdccf7ccdfc19eca22fdd4514ac,8bacbf6be959973b28b691713a872c12eae69eec)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.160,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.57,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.11,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-23T15:30:14.849005+00:00", "updated": "2026-10-29T20:00:29.076292+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}