{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89686", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.749Z", "datePublished": "2026-09-11T19:46:07.877Z", "dateUpdated": "2026-09-11T19:46:07.877Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:07.877Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke\n\nnfsd4_alloc_layout_stateid reads fp->fi_deleg_file without holding\nfi_lock when the parent stateid is a delegation. A concurrent delegation\nrevoke via the laundromat can clear fi_deleg_file under fi_lock, causing\nnfsd_file_get() to return NULL and triggering the BUG_ON.\n\nThis race is client-reachable: two NFS clients can trigger it by having\none hold a delegation while another opens the same file to force a\nrecall. When the first client doesn't respond to the recall, the\nlaundromat revokes it. A concurrent LAYOUTGET from any client using the\ndelegation stateid hits the race window.\n\nFix this by taking fi_lock around the fi_deleg_file read in the\nSC_TYPE_DELEG path, matching the locking discipline of the\nfind_any_file() arm, and replacing the BUG_ON with a graceful error\nreturn that cleans up the partially-initialized layout stateid."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4layouts.c"], "versions": [{"version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "lessThan": "c517f27498757e616d2a8fe6d16caad1fee422e6", "status": "affected", "versionType": "git"}, {"version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "lessThan": "607a56fea772c1f4f4989d8e255dd4f7192d9604", "status": "affected", "versionType": "git"}, {"version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "lessThan": "97bda8b4284d90897a1f1922e5082ff9e35d7c7e", "status": "affected", "versionType": "git"}, {"version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "lessThan": "ca94ba36172046be6a694a7986f6931e47ed4d51", "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/nfsd/nfs4layouts.c"], "versions": [{"version": "4.0", "status": "affected"}, {"version": "0", "lessThan": "4.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "4.0", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c517f27498757e616d2a8fe6d16caad1fee422e6"}, {"url": "https://git.kernel.org/stable/c/607a56fea772c1f4f4989d8e255dd4f7192d9604"}, {"url": "https://git.kernel.org/stable/c/97bda8b4284d90897a1f1922e5082ff9e35d7c7e"}, {"url": "https://git.kernel.org/stable/c/ca94ba36172046be6a694a7986f6931e47ed4d51"}], "title": "nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4layouts.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c517f27498757e616d2a8fe6d16caad1fee422e6", "status": "affected", "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "versionType": "git"}, {"lessThan": "607a56fea772c1f4f4989d8e255dd4f7192d9604", "status": "affected", "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "versionType": "git"}, {"lessThan": "97bda8b4284d90897a1f1922e5082ff9e35d7c7e", "status": "affected", "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "versionType": "git"}, {"lessThan": "ca94ba36172046be6a694a7986f6931e47ed4d51", "status": "affected", "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4layouts.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.0"}, {"lessThan": "4.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nnfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke\n\nnfsd4_alloc_layout_stateid reads fp->fi_deleg_file without holding\nfi_lock when the parent stateid is a delegation. A concurrent delegation\nrevoke via the laundromat can clear fi_deleg_file under fi_lock, causing\nnfsd_file_get() to return NULL and triggering the BUG_ON.\n\nThis race is client-reachable: two NFS clients can trigger it by having\none hold a delegation while another opens the same file to force a\nrecall. When the first client doesn't respond to the recall, the\nlaundromat revokes it. A concurrent LAYOUTGET from any client using the\ndelegation stateid hits the race window.\n\nFix this by taking fi_lock around the fi_deleg_file read in the\nSC_TYPE_DELEG path, matching the locking discipline of the\nfind_any_file() arm, and replacing the BUG_ON with a graceful error\nreturn that cleans up the partially-initialized layout stateid."}], "id": "CVE-2026-89686", "lastModified": "2026-09-11T20:19:55.533", "metrics": {}, "published": "2026-09-11T20:19:55.533", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/607a56fea772c1f4f4989d8e255dd4f7192d9604"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/97bda8b4284d90897a1f1922e5082ff9e35d7c7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c517f27498757e616d2a8fe6d16caad1fee422e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca94ba36172046be6a694a7986f6931e47ed4d51"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (nfsd): Denial of Service due to a race condition in NFSv4 delegation revoke", "id": "2532098", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532098"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's Network File System Daemon (nfsd) for NFSv4 layouts. A race condition allows a remote attacker to trigger a kernel panic, leading to a Denial of Service (DoS). This occurs when the `nfsd4_alloc_layout_stateid` function accesses a file pointer without proper locking during a concurrent delegation revoke, which can be orchestrated by two NFS clients interacting with the same file."], "name": "CVE-2026-89686", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:46:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89686\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89686\nhttps://git.kernel.org/stable/c/607a56fea772c1f4f4989d8e255dd4f7192d9604\nhttps://git.kernel.org/stable/c/97bda8b4284d90897a1f1922e5082ff9e35d7c7e\nhttps://git.kernel.org/stable/c/c517f27498757e616d2a8fe6d16caad1fee422e6\nhttps://git.kernel.org/stable/c/ca94ba36172046be6a694a7986f6931e47ed4d51"], "threat_severity": "Important"}

{}