CVE-2026-74316

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The stid remains in the IDR and on the\nper-client list until the client is destroyed.\n\nRemove the layout stid from the per-client list and call\nnfs4_put_stid() to drop the creation reference. When the\nrefcount reaches zero, nfsd4_free_layout_stateid() handles the\nremaining cleanup: cancelling the fence worker, removing from\nthe per-file list, and freeing the slab object."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The flaw is reached through nfsd's NFSv4 OP_FREE_STATEID handler, processing attacker-controlled RPC compounds over the network on TCP port 2049 via nfsd_dispatch to nfsd4_proc_compound to nfsd4_free_stateid.\nAC:L - Once a client holds admin-revoked pNFS layout stateids, sending FREE_STATEID reliably triggers the leak every time; the attacker controls layout acquisition and the freeing RPC on both sides of the interaction.\nPR:N - Exploitation requires only remote NFSv4 client access to a pNFS-enabled export (EXCHANGE_ID/CREATE_SESSION plus FREE_STATEID), not local shell access or elevated privileges on the Linux host.\nUI:N - No administrator or end-user action on the server is required beyond normal NFS service exposure; the leak is triggered entirely by malicious NFS protocol traffic from a network client.\nS:U - Impact is confined to kernel memory and nfsd state management within the same kernel security boundary; there is no VM escape, container breakout, or cross-authority boundary crossing.\nC:N - The bug retains unreleased layout stateid structures in the IDR and per-client lists without corrupting memory or exposing kernel data; there is no out-of-bounds read or information disclosure primitive.\nI:N - No data modification or memory corruption occurs; the stateid is simply not freed when it should be, leaving stale entries without enabling arbitrary writes or code execution.\nA:H - Each triggered FREE_STATEID permanently leaks a layout stateid slab object and IDR slot until client teardown; a remote NFS client can repeat this for every admin-revoked pNFS layout, causing unbounded kernel memory consumption and nfsd DoS."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4state.c"], "versions": [{"version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "7ed62f7040ee182cf7dea5798f9e114235b31dae", "status": "affected", "versionType": "git"}, {"version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "da6f86ff4f2dd490bea52419a49e19680efd5847", "status": "affected", "versionType": "git"}, {"version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "8024028ef91616cf91cc669f2446a0406bc0ba19", "status": "affected", "versionType": "git"}, {"version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "86b9898920a6d02b4149f4fef9efd77b8aa3b9ca", "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/nfs4state.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "6.9", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7ed62f7040ee182cf7dea5798f9e114235b31dae"}, {"url": "https://git.kernel.org/stable/c/da6f86ff4f2dd490bea52419a49e19680efd5847"}, {"url": "https://git.kernel.org/stable/c/8024028ef91616cf91cc669f2446a0406bc0ba19"}, {"url": "https://git.kernel.org/stable/c/86b9898920a6d02b4149f4fef9efd77b8aa3b9ca"}], "title": "NFSD: Handle layout stid in nfsd4_drop_revoked_stid()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74316", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:53:13.510703Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:32.624Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74316", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:53:13.510703Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:53:14.583Z"}}], "cna": {"title": "NFSD: Handle layout stid in nfsd4_drop_revoked_stid()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The flaw is reached through nfsd's NFSv4 OP_FREE_STATEID handler, processing attacker-controlled RPC compounds over the network on TCP port 2049 via nfsd_dispatch to nfsd4_proc_compound to nfsd4_free_stateid.\nAC:L - Once a client holds admin-revoked pNFS layout stateids, sending FREE_STATEID reliably triggers the leak every time; the attacker controls layout acquisition and the freeing RPC on both sides of the interaction.\nPR:N - Exploitation requires only remote NFSv4 client access to a pNFS-enabled export (EXCHANGE_ID/CREATE_SESSION plus FREE_STATEID), not local shell access or elevated privileges on the Linux host.\nUI:N - No administrator or end-user action on the server is required beyond normal NFS service exposure; the leak is triggered entirely by malicious NFS protocol traffic from a network client.\nS:U - Impact is confined to kernel memory and nfsd state management within the same kernel security boundary; there is no VM escape, container breakout, or cross-authority boundary crossing.\nC:N - The bug retains unreleased layout stateid structures in the IDR and per-client lists without corrupting memory or exposing kernel data; there is no out-of-bounds read or information disclosure primitive.\nI:N - No data modification or memory corruption occurs; the stateid is simply not freed when it should be, leaving stale entries without enabling arbitrary writes or code execution.\nA:H - Each triggered FREE_STATEID permanently leaks a layout stateid slab object and IDR slot until client teardown; a remote NFS client can repeat this for every admin-revoked pNFS layout, causing unbounded kernel memory consumption and nfsd DoS."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "7ed62f7040ee182cf7dea5798f9e114235b31dae", "versionType": "git"}, {"status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "da6f86ff4f2dd490bea52419a49e19680efd5847", "versionType": "git"}, {"status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "8024028ef91616cf91cc669f2446a0406bc0ba19", "versionType": "git"}, {"status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "lessThan": "86b9898920a6d02b4149f4fef9efd77b8aa3b9ca", "versionType": "git"}], "programFiles": ["fs/nfsd/nfs4state.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"status": "unaffected", "version": "0", "lessThan": "6.9", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfsd/nfs4state.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7ed62f7040ee182cf7dea5798f9e114235b31dae"}, {"url": "https://git.kernel.org/stable/c/da6f86ff4f2dd490bea52419a49e19680efd5847"}, {"url": "https://git.kernel.org/stable/c/8024028ef91616cf91cc669f2446a0406bc0ba19"}, {"url": "https://git.kernel.org/stable/c/86b9898920a6d02b4149f4fef9efd77b8aa3b9ca"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Handle layout stid in nfsd4_drop_revoked_stid()\n\nnfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a\nclient sends FREE_STATEID for an admin-revoked layout stid, the\ndefault branch releases cl_lock and returns without unhashing or\nreleasing the stid. The stid remains in the IDR and on the\nper-client list until the client is destroyed.\n\nRemove the layout stid from the per-client list and call\nnfs4_put_stid() to drop the creation reference. When the\nrefcount reaches zero, nfsd4_free_layout_stateid() handles the\nremaining cleanup: cancelling the fence worker, removing from\nthe per-file list, and freeing the slab object."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:50.196Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74316", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:32.624Z", "dateReserved": "2026-08-15T05:44:03.883Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:58:14.165Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4state.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7ed62f7040ee182cf7dea5798f9e114235b31dae", "status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "versionType": "git"}, {"lessThan": "da6f86ff4f2dd490bea52419a49e19680efd5847", "status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "versionType": "git"}, {"lessThan": "8024028ef91616cf91cc669f2446a0406bc0ba19", "status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "versionType": "git"}, {"lessThan": "86b9898920a6d02b4149f4fef9efd77b8aa3b9ca", "status": "affected", "version": "1e33e1414bec54a4feafa9e67e2617031be0afe2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4state.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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: Handle layout stid in nfsd4_drop_revoked_stid()\n\nnfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a\nclient sends FREE_STATEID for an admin-revoked layout stid, the\ndefault branch releases cl_lock and returns without unhashing or\nreleasing the stid. The stid remains in the IDR and on the\nper-client list until the client is destroyed.\n\nRemove the layout stid from the per-client list and call\nnfs4_put_stid() to drop the creation reference. When the\nrefcount reaches zero, nfsd4_free_layout_stateid() handles the\nremaining cleanup: cancelling the fence worker, removing from\nthe per-file list, and freeing the slab object."}], "id": "CVE-2026-74316", "lastModified": "2026-10-16T19:17:38.987", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74316", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:53:13.510703Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:31.890", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7ed62f7040ee182cf7dea5798f9e114235b31dae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8024028ef91616cf91cc669f2446a0406bc0ba19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86b9898920a6d02b4149f4fef9efd77b8aa3b9ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da6f86ff4f2dd490bea52419a49e19680efd5847"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: NFSD: Handle layout stid in nfsd4_drop_revoked_stid()", "id": "2516878", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516878"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSD: Handle layout stid in nfsd4_drop_revoked_stid()\nnfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a\nclient sends FREE_STATEID for an admin-revoked layout stid, the\ndefault branch releases cl_lock and returns without unhashing or\nreleasing the stid. The stid remains in the IDR and on the\nper-client list until the client is destroyed.\nRemove the layout stid from the per-client list and call\nnfs4_put_stid() to drop the creation reference. When the\nrefcount reaches zero, nfsd4_free_layout_stateid() handles the\nremaining cleanup: cancelling the fence worker, removing from\nthe per-file list, and freeing the slab object.", "A flaw was found in the Linux kernel's Network File System Daemon (NFSD) component. When a client sends a request to free an admin-revoked layout state ID, the system fails to properly release the associated resources. This oversight can lead to a resource leak, potentially allowing a remote attacker to cause a Denial of Service (DoS) by exhausting available memory or state IDs."], "name": "CVE-2026-74316", "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": "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": "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"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74316\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74316\nhttps://lore.kernel.org/linux-cve-announce/2026081552-CVE-2026-74316-fa96@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e33e1414bec54a4feafa9e67e2617031be0afe2,7ed62f7040ee182cf7dea5798f9e114235b31dae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e33e1414bec54a4feafa9e67e2617031be0afe2,da6f86ff4f2dd490bea52419a49e19680efd5847)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e33e1414bec54a4feafa9e67e2617031be0afe2,8024028ef91616cf91cc669f2446a0406bc0ba19)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e33e1414bec54a4feafa9e67e2617031be0afe2,86b9898920a6d02b4149f4fef9efd77b8aa3b9ca)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T12:30:07.841352+00:00", "updated": "2026-08-22T02:45:03.714863+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}