{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89485", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.712Z", "datePublished": "2026-09-11T19:43:39.403Z", "dateUpdated": "2026-09-13T06:29:54.037Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-13T06:29:54.037Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: pin next file across nlm_inspect_file lock-drop\n\nnlm_traverse_files() pins the current file with f_count++ across\na mutex_unlock for nlm_inspect_file(), but nothing pins the saved\nnext pointer. A concurrent nlm_release_file() can kfree the next\nfile during the unlock window, and the iterator dereferences freed\nmemory on the next loop step.\n\nPin both current and next before the lock-drop. Advance by\nswapping the pinned cursors at the end of each iteration so next\nis always held alive across the unlock.\n\nAlways call nlm_file_release() after dropping the iteration pin,\nregardless of whether the file matched the predicate. Use\nnlm_file_inuse(), which does a live walk of the inode lock list,\nrather than the cached f_locks field, so skipped files that never\nran nlm_inspect_file() are evaluated correctly.\n\nBecause every file in a hash bucket is now pinned and released,\nfiles skipped by the is_failover_file predicate that have no\nlocks, blocks, shares, or external references are deleted during\ntraversal. The old code never evaluated skipped files for\ncleanup. The new behavior is intentional: such files are stale\nand should not persist in the table."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - lockd is the in-kernel NLM RPC server on TCP/UDP, reached by remote NFSv3 clients. nlm_traverse_files() runs on NLMPROC_FREE_ALL, and nlm_release_file() runs from LOCK/UNLOCK/TEST and from rpciod NLM_GRANTED_MSG completion, so the UAF is triggered by network NLM traffic.\nAC:L - A remote NFS client can populate nlm_files via LOCK, send FREE_ALL to drop nlm_file_mutex inside nlm_traverse_files(), and concurrently complete in-flight GRANTED_MSG callbacks so rpciod's nlmsvc_grant_release() calls nlm_release_file() on the unpinned next object; the attacker drives both sides of the race.\nPR:N - lockd_authenticate() accepts RPC_AUTH_NULL and RPC_AUTH_UNIX. FREE_ALL is not a privileged-port callback, and nlm_fopen() opens files with NFSD_MAY_BYPASS_GSS|NFSD_MAY_NLM, so no host account or capability is required.\nUI:N - Exploitation uses only attacker-sent NLM RPCs (LOCK/FREE_ALL and grant-callback completion); no victim user or administrator action is required.\nS:U - The use-after-free is in the host kernel's lockd file table and impacts that same kernel; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - The iterator dereferences a kfree'd struct nlm_file (list pointers, f_file[], f_count). This UAF lets an attacker reuse the slab object and obtain a kernel read primitive, so confidentiality impact is high.\nI:H - The same nlm_file UAF is a kernel heap free of list nodes, mutex state, and struct file pointers, which can be sprayed for an arbitrary write and control-flow hijack, so integrity impact is high.\nA:H - Walking the freed nlm_file in nlm_traverse_files() causes a kernel oops/panic (KASAN slab-use-after-free), so availability impact is high."}]}], "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": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "lessThan": "c24bdb7df2f34bdc38ca8a73796f5acb40f1830c", "status": "affected", "versionType": "git"}, {"version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "lessThan": "41f0a6d31615fcae261bf28a0aa50050dc93a401", "status": "affected", "versionType": "git"}, {"version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "lessThan": "e999a88133654c6dfc68487fb49da5f20dfa2d4f", "status": "affected", "versionType": "git"}, {"version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "lessThan": "526c49cff3f72c3ec74752016380c7567040581b", "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/lockd/svcsubs.c"], "versions": [{"version": "2.6.18", "status": "affected"}, {"version": "0", "lessThan": "2.6.18", "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": "2.6.18", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c"}, {"url": "https://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401"}, {"url": "https://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f"}, {"url": "https://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b"}], "title": "lockd: pin next file across nlm_inspect_file lock-drop", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/lockd/svcsubs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c24bdb7df2f34bdc38ca8a73796f5acb40f1830c", "status": "affected", "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "versionType": "git"}, {"lessThan": "41f0a6d31615fcae261bf28a0aa50050dc93a401", "status": "affected", "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "versionType": "git"}, {"lessThan": "e999a88133654c6dfc68487fb49da5f20dfa2d4f", "status": "affected", "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "versionType": "git"}, {"lessThan": "526c49cff3f72c3ec74752016380c7567040581b", "status": "affected", "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/lockd/svcsubs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.18"}, {"lessThan": "2.6.18", "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\nlockd: pin next file across nlm_inspect_file lock-drop\n\nnlm_traverse_files() pins the current file with f_count++ across\na mutex_unlock for nlm_inspect_file(), but nothing pins the saved\nnext pointer. A concurrent nlm_release_file() can kfree the next\nfile during the unlock window, and the iterator dereferences freed\nmemory on the next loop step.\n\nPin both current and next before the lock-drop. Advance by\nswapping the pinned cursors at the end of each iteration so next\nis always held alive across the unlock.\n\nAlways call nlm_file_release() after dropping the iteration pin,\nregardless of whether the file matched the predicate. Use\nnlm_file_inuse(), which does a live walk of the inode lock list,\nrather than the cached f_locks field, so skipped files that never\nran nlm_inspect_file() are evaluated correctly.\n\nBecause every file in a hash bucket is now pinned and released,\nfiles skipped by the is_failover_file predicate that have no\nlocks, blocks, shares, or external references are deleted during\ntraversal. The old code never evaluated skipped files for\ncleanup. The new behavior is intentional: such files are stale\nand should not persist in the table."}], "id": "CVE-2026-89485", "lastModified": "2026-09-13T07:17:11.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:30.173", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: lockd use-after-free vulnerability leading to system instability", "id": "2532183", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532183"}, "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-825", "details": ["A flaw was found in the `lockd` component of the Linux kernel. This use-after-free vulnerability occurs in the `nlm_traverse_files()` function when a file's memory is prematurely released while an iterator still holds a pointer to it. A remote attacker could potentially exploit this to cause system instability or a denial of service (DoS) by triggering a concurrent file release during a specific unlock window."], "name": "CVE-2026-89485", "public_date": "2026-09-11T19:43:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89485\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89485\nhttps://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401\nhttps://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b\nhttps://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c\nhttps://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01df9c5e918ae5559f2d96da0143f8bfbb9e6171,c24bdb7df2f34bdc38ca8a73796f5acb40f1830c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01df9c5e918ae5559f2d96da0143f8bfbb9e6171,41f0a6d31615fcae261bf28a0aa50050dc93a401)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01df9c5e918ae5559f2d96da0143f8bfbb9e6171,e999a88133654c6dfc68487fb49da5f20dfa2d4f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[01df9c5e918ae5559f2d96da0143f8bfbb9e6171,526c49cff3f72c3ec74752016380c7567040581b)"}}], "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": "2.6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-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": "2026-09-12T02:45:06.765767+00:00", "updated": "2026-09-13T05:30:06.458772+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}