CVE-2026-72218

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At that label\n*result and file->f_count are updated before the error is returned.\nThe wrappers nlm3svc_lookup_file() and nlm4svc_lookup_file() then\nbail out of their switch without copying *result back to their\ncaller, so the proc handler's local nlm_file pointer remains NULL\nand the cleanup path skips nlm_release_file(). The f_count\nincrement is never released, and nlm_traverse_files() can no\nlonger reap the file because its refcount never returns to zero\nbetween requests.\n\nShort-circuit the cached path so neither *result nor f_count is\ntouched when nlm_do_fopen() fails on a hashed nlm_file."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/lockd/svcsubs.c"], "versions": [{"version": "e580323ac0b51ad10ec2e181d1f777479b7983e7", "lessThan": "6cd84cefd8b73e85b9eda17b319bd40a670f3a38", "status": "affected", "versionType": "git"}, {"version": "7f024fcd5c97dc70bb9121c80407cf3cf9be7159", "lessThan": "fe3b45b56b6c3d4b6b341de27fa291005287a21c", "status": "affected", "versionType": "git"}, {"version": "7f024fcd5c97dc70bb9121c80407cf3cf9be7159", "lessThan": "cb3420c047957e565101585bb4f15e1a6e3de6b0", "status": "affected", "versionType": "git"}, {"version": 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"https://git.kernel.org/stable/c/70a38f87bed7f0694fd07988b47b2db1e10d8df3"}], "title": "lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72218", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:52:45.774483Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:55:22.326Z"}}]}}

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At that label\n*result and file->f_count are updated before the error is returned.\nThe wrappers nlm3svc_lookup_file() and nlm4svc_lookup_file() then\nbail out of their switch without copying *result back to their\ncaller, so the proc handler's local nlm_file pointer remains NULL\nand the cleanup path skips nlm_release_file(). The f_count\nincrement is never released, and nlm_traverse_files() can no\nlonger reap the file because its refcount never returns to zero\nbetween requests.\n\nShort-circuit the cached path so neither *result nor f_count is\ntouched when nlm_do_fopen() fails on a hashed nlm_file."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "5.10.220"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:10:33.204Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72218", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:55:22.326Z", "dateReserved": "2026-08-09T03:40:39.913Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:54:11.672Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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At that label\n*result and file->f_count are updated before the error is returned.\nThe wrappers nlm3svc_lookup_file() and nlm4svc_lookup_file() then\nbail out of their switch without copying *result back to their\ncaller, so the proc handler's local nlm_file pointer remains NULL\nand the cleanup path skips nlm_release_file(). The f_count\nincrement is never released, and nlm_traverse_files() can no\nlonger reap the file because its refcount never returns to zero\nbetween requests.\n\nShort-circuit the cached path so neither *result nor f_count is\ntouched when nlm_do_fopen() fails on a hashed nlm_file."}], "id": "CVE-2026-72218", "lastModified": "2026-11-06T17:19:39.690", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72218", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:52:45.774483Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:21:40.613", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3a5c55a19cad62f2973be25fe96a1a9e7f618e8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/46d59ff421824b6483549d87f14efffbbbd1f6cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6cd84cefd8b73e85b9eda17b319bd40a670f3a38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/70a38f87bed7f0694fd07988b47b2db1e10d8df3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7ce4c23e783e766507b2cef27bbf97e9ca944f1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/84008bf1860e0ef8059a7583a1163f36b704d08a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cb3420c047957e565101585bb4f15e1a6e3de6b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fe3b45b56b6c3d4b6b341de27fa291005287a21c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure", "id": "2516325", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516325"}, "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-772", "details": ["A flaw was found in the Linux kernel's lockd component. A reference count leak occurs when nlm_do_fopen() fails on a cached file path. This prevents the file's reference count from returning to zero, causing a resource leak. Over time, this can lead to resource exhaustion and a Denial of Service (DoS) condition."], "name": "CVE-2026-72218", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "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-2026-72218\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72218\nhttps://lore.kernel.org/linux-cve-announce/2026081547-CVE-2026-72218-9e91@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e580323ac0b51ad10ec2e181d1f777479b7983e7,6cd84cefd8b73e85b9eda17b319bd40a670f3a38)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,fe3b45b56b6c3d4b6b341de27fa291005287a21c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,cb3420c047957e565101585bb4f15e1a6e3de6b0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,7ce4c23e783e766507b2cef27bbf97e9ca944f1a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,84008bf1860e0ef8059a7583a1163f36b704d08a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,46d59ff421824b6483549d87f14efffbbbd1f6cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,3a5c55a19cad62f2973be25fe96a1a9e7f618e8a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7f024fcd5c97dc70bb9121c80407cf3cf9be7159,70a38f87bed7f0694fd07988b47b2db1e10d8df3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.220,5.10.261)"}}], "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": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"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": "2026-08-15T16:45:10.665303+00:00", "updated": "2026-08-18T19:45:03.302076+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}