CVE-2022-50241

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The sc_cp_list that the expired copy state was\ninserted on was already freed.\n\nWhen COPY completes, the Linux client normally sends LOCKU(lock_state x),\nFREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server.\nThe nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state\nfrom the s2s_cp_stateids list before freeing the lock state's stid.\n\nHowever, sometimes the CLOSE was sent before the FREE_STATEID request.\nWhen this happens, the nfsd4_close_open_stateid call from nfsd4_close\nfrees all lock states on its st_locks list without cleaning up the copy\nstate on the sc_cp_list list. When the time the FREE_STATEID arrives the\nserver returns BAD_STATEID since the lock state was freed. This causes\nthe use-after-free error to occur when the laundromat tries to free\nthe expired cpntf_state.\n\nThis patch adds a call to nfs4_free_cpntf_statelist in\nnfsd4_close_open_stateid to clean up the copy state before calling\nfree_ol_stateid_reaplist to free the lock state's stid on the reaplist."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The flaw is in the in-kernel NFS server (nfsd); COPY_NOTIFY, CLOSE, and FREE_STATEID are processed from NFSv4.2 compounds over the network (TCP/2049), so a remote NFS client reaches the vulnerable path.\nAC:L - A malicious client fully controls the sequence\u2014OPEN/LOCK, COPY_NOTIFY to attach cpntf_state to sc_cp_list, then CLOSE before FREE_STATEID\u2014so the dangling cpntf entry and subsequent laundromat list_del are deterministic with no race outside attacker control.\nPR:L - The attacker must be an established NFSv4.2 client of an export with a valid open/lock stateid to issue COPY_NOTIFY, which is authenticated low-privilege service access rather than a pre-authentication path.\nUI:N - No victim action is required; the attacking client drives every NFS operation, and the server's own laundromat worker triggers the use-after-free after lease expiry.\nS:U - The use-after-free corrupts kernel slab memory within the host nfsd security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The dangling cpntf_state remains linked into a freed parent stateid's sc_cp_list; reclaim of that slab object lets an attacker who grooms the heap control freed contents, enabling arbitrary kernel memory disclosure.\nI:H - Laundromat's list_del on the stale cp_list writes heap pointers into the freed, potentially reallocated stateid_slab object\u2014a classic UAF write primitive usable for controlled memory modification and control-flow hijacking.\nA:H - The list corruption reliably causes a kernel oops/BUG/panic in laundromat_main when freeing the expired cpntf_state, fully disrupting availability of the NFS server host."}]}], "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": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "bbacfcde5fff25ac22597e8373a065c647da6738", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "83b94969751a691347606dbe6b1865efcfa5a643", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "6ea71246b7a02af675d733e72d14bd0d591d5f4a", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "35aa0fb8c3033a3d78603356e96fc18c5b9cceb2", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "019805fea91599b22dfa62ffb29c022f35abeb06", "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": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "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": "5.6", "versionEndExcluding": "5.10.150"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.19.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.0.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738"}, {"url": "https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643"}, {"url": "https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a"}, {"url": "https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2"}, {"url": "https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06"}], "title": "NFSD: fix use-after-free on source server when doing inter-server copy", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-50241", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:30:36.338429Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:31:19.268Z"}}]}}

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the attacking client drives every NFS operation, and the server's own laundromat worker triggers the use-after-free after lease expiry.\nS:U - The use-after-free corrupts kernel slab memory within the host nfsd security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The dangling cpntf_state remains linked into a freed parent stateid's sc_cp_list; reclaim of that slab object lets an attacker who grooms the heap control freed contents, enabling arbitrary kernel memory disclosure.\nI:H - Laundromat's list_del on the stale cp_list writes heap pointers into the freed, potentially reallocated stateid_slab object\u2014a classic UAF write primitive usable for controlled memory modification and control-flow hijacking.\nA:H - The list corruption reliably causes a kernel oops/BUG/panic in laundromat_main when freeing the expired cpntf_state, fully disrupting availability of the NFS server host."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "bbacfcde5fff25ac22597e8373a065c647da6738", "versionType": "git"}, {"status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "83b94969751a691347606dbe6b1865efcfa5a643", "versionType": "git"}, {"status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "6ea71246b7a02af675d733e72d14bd0d591d5f4a", "versionType": "git"}, {"status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "35aa0fb8c3033a3d78603356e96fc18c5b9cceb2", "versionType": "git"}, {"status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "019805fea91599b22dfa62ffb29c022f35abeb06", "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": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.150", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.75", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.19.17", "versionType": "semver", "lessThanOrEqual": "5.19.*"}, {"status": "unaffected", "version": "6.0.3", "versionType": "semver", "lessThanOrEqual": "6.0.*"}, {"status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfsd/nfs4state.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738"}, {"url": "https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643"}, {"url": "https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a"}, {"url": "https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2"}, {"url": "https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix use-after-free on source server when doing inter-server copy\n\nUse-after-free occurred when the laundromat tried to free expired\ncpntf_state entry on the s2s_cp_stateids list after inter-server\ncopy completed. The sc_cp_list that the expired copy state was\ninserted on was already freed.\n\nWhen COPY completes, the Linux client normally sends LOCKU(lock_state x),\nFREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server.\nThe nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state\nfrom the s2s_cp_stateids list before freeing the lock state's stid.\n\nHowever, sometimes the CLOSE was sent before the FREE_STATEID request.\nWhen this happens, the nfsd4_close_open_stateid call from nfsd4_close\nfrees all lock states on its st_locks list without cleaning up the copy\nstate on the sc_cp_list list. When the time the FREE_STATEID arrives the\nserver returns BAD_STATEID since the lock state was freed. This causes\nthe use-after-free error to occur when the laundromat tries to free\nthe expired cpntf_state.\n\nThis patch adds a call to nfs4_free_cpntf_statelist in\nnfsd4_close_open_stateid to clean up the copy state before calling\nfree_ol_stateid_reaplist to free the lock state's stid on the reaplist."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.150", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.75", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.19.17", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.0.3", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:53.698Z"}}}, "cveMetadata": {"cveId": "CVE-2022-50241", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:31:19.268Z", "dateReserved": "2025-09-15T13:58:00.971Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-15T14:01:47.539Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The sc_cp_list that the expired copy state was\ninserted on was already freed.\n\nWhen COPY completes, the Linux client normally sends LOCKU(lock_state x),\nFREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server.\nThe nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state\nfrom the s2s_cp_stateids list before freeing the lock state's stid.\n\nHowever, sometimes the CLOSE was sent before the FREE_STATEID request.\nWhen this happens, the nfsd4_close_open_stateid call from nfsd4_close\nfrees all lock states on its st_locks list without cleaning up the copy\nstate on the sc_cp_list list. When the time the FREE_STATEID arrives the\nserver returns BAD_STATEID since the lock state was freed. This causes\nthe use-after-free error to occur when the laundromat tries to free\nthe expired cpntf_state.\n\nThis patch adds a call to nfs4_free_cpntf_statelist in\nnfsd4_close_open_stateid to clean up the copy state before calling\nfree_ol_stateid_reaplist to free the lock state's stid on the reaplist."}], "id": "CVE-2022-50241", "lastModified": "2026-10-15T22:17:28.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-50241", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:30:36.338429Z", "version": "2.0.3"}}]}, "published": "2025-09-15T14:15:34.360", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: NFSD: fix use-after-free on source server when doing inter-server copy", "id": "2395429", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395429"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2022-50241", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2025-09-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50241\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50241\nhttps://lore.kernel.org/linux-cve-announce/2025091548-CVE-2022-50241-0f92@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-09-17T10:08:22.405128+00:00", "updated": "2025-09-17T10:08:22.405195+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}