CVE-2025-40324

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No local access is needed \u2014 a crafted COMPOUND from any host that can reach nfsd is sufficient.\nAC:L - Within the vulnerable configuration (nfsd read tracepoints enabled, the configuration CVSS directs us to score), a single well-formed `COMPOUND{READ}` with no preceding PUTFH triggers the NULL dereference deterministically \u2014 no race, no memory-layout dependency, no timing window, and the attacker fully controls the request.\nPR:N - The crash occurs before any authorization gate: no filehandle, no stateid, no session/clientid, and no export access check is reached, and AUTH_SYS verifies no credentials. The NFSv4.1 `nfserr_op_not_in_session` path (nfs4proc.c:3087-3093) fires before session establishment, making this a pre-authentication code path.\nUI:N - The attacker sends the malformed COMPOUND directly to the NFS server; no administrator or client-side action is required at exploitation time.\nS:U - The NULL dereference oops occurs in the nfsd kthread within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - `nfsd4_decode_read()` memsets the whole `struct nfsd4_read`, so `rd_rqstp`/`rd_fhp` are guaranteed NULL rather than stale pointers \u2014 the fault occurs on the first access and no data is read into the trace buffer or otherwise disclosed.\nI:N - The tracepoint's `TP_fast_assign` performs only loads from the NULL pointers; there is no out-of-bounds or use-after-free write and no control-flow hijack primitive.\nA:H - A NULL pointer dereference oops kills the nfsd kernel thread mid-compound (leaking the unreleased current_fh/save_fh references), and the request can be replayed to exhaust every nfsd thread; with panic_on_oops set it is an immediate kernel panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4proc.c"], "versions": [{"version": "65a33135e91e6dd661ecdf1194b9d90c49ae3570", "lessThan": "930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1", "status": "affected", "versionType": "git"}, {"version": "b11d8162c24af4a351d21e2c804d25ca493305e3", "lessThan": "375fdd8993cecc48afa359728a6e70b280dde1c8", "status": "affected", "versionType": "git"}, {"version": "b623a8e5d38a69a3ef8644acb1030dd7c7bc28b3", "lessThan": "2ac46606b2cc49e78d8e3d8f2685e79e9ba73020", "status": "affected", "versionType": "git"}, {"version": "15a8b55dbb1ba154d82627547c5761cac884d810", "lessThan": "03524ccff698d4a77d096ed529073d91f5edee5d", "status": "affected", "versionType": "git"}, {"version": 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No local access is needed \u2014 a crafted COMPOUND from any host that can reach nfsd is sufficient.\nAC:L - Within the vulnerable configuration (nfsd read tracepoints enabled, the configuration CVSS directs us to score), a single well-formed `COMPOUND{READ}` with no preceding PUTFH triggers the NULL dereference deterministically \u2014 no race, no memory-layout dependency, no timing window, and the attacker fully controls the request.\nPR:N - The crash occurs before any authorization gate: no filehandle, no stateid, no session/clientid, and no export access check is reached, and AUTH_SYS verifies no credentials. The NFSv4.1 `nfserr_op_not_in_session` path (nfs4proc.c:3087-3093) fires before session establishment, making this a pre-authentication code path.\nUI:N - The attacker sends the malformed COMPOUND directly to the NFS server; no administrator or client-side action is required at exploitation time.\nS:U - The NULL dereference oops occurs in the nfsd kthread within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - `nfsd4_decode_read()` memsets the whole `struct nfsd4_read`, so `rd_rqstp`/`rd_fhp` are guaranteed NULL rather than stale pointers \u2014 the fault occurs on the first access and no data is read into the trace buffer or otherwise disclosed.\nI:N - The tracepoint's `TP_fast_assign` performs only loads from the NULL pointers; there is no out-of-bounds or use-after-free write and no control-flow hijack primitive.\nA:H - A NULL pointer dereference oops kills the nfsd kernel thread mid-compound (leaking the unreleased current_fh/save_fh references), and the request can be replayed to exhaust every nfsd thread; with panic_on_oops set it is an immediate kernel panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "65a33135e91e6dd661ecdf1194b9d90c49ae3570", "lessThan": "930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1", "versionType": "git"}, {"status": "affected", "version": "b11d8162c24af4a351d21e2c804d25ca493305e3", "lessThan": "375fdd8993cecc48afa359728a6e70b280dde1c8", "versionType": "git"}, {"status": "affected", "version": "b623a8e5d38a69a3ef8644acb1030dd7c7bc28b3", "lessThan": "2ac46606b2cc49e78d8e3d8f2685e79e9ba73020", "versionType": "git"}, {"status": "affected", "version": "15a8b55dbb1ba154d82627547c5761cac884d810", "lessThan": "03524ccff698d4a77d096ed529073d91f5edee5d", "versionType": "git"}, {"status": "affected", "version": "15a8b55dbb1ba154d82627547c5761cac884d810", "lessThan": 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["fs/nfsd/nfs4proc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1"}, {"url": "https://git.kernel.org/stable/c/375fdd8993cecc48afa359728a6e70b280dde1c8"}, {"url": "https://git.kernel.org/stable/c/2ac46606b2cc49e78d8e3d8f2685e79e9ba73020"}, {"url": "https://git.kernel.org/stable/c/03524ccff698d4a77d096ed529073d91f5edee5d"}, {"url": "https://git.kernel.org/stable/c/a4948875ed0599c037dc438c11891c9012721b1d"}, {"url": "https://git.kernel.org/stable/c/8f244b773c63fa480c9a3bd1ae04f5272f285e89"}, {"url": "https://git.kernel.org/stable/c/abb1f08a2121dd270193746e43b2a9373db9ad84"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix crash in nfsd4_read_release()\n\nWhen tracing is enabled, the trace_nfsd_read_done trace point\ncrashes during the pynfs read.testNoFh test."}], "cpeApplicability": 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"versions": [{"status": "affected", "version": "6.3"}, {"lessThan": "6.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.247", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.197", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.159", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.117", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.58", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.18", "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 crash in nfsd4_read_release()\n\nWhen tracing is enabled, the trace_nfsd_read_done trace point\ncrashes during the pynfs read.testNoFh test."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nNFSD: Correcci\u00f3n de un fallo en nfsd4_read_release()\n\nCuando el rastreo est\u00e1 habilitado, el punto de rastreo trace_nfsd_read_done se bloquea durante la prueba pynfs read.testNoFh."}], "id": "CVE-2025-40324", "lastModified": "2026-10-15T22:19:08.507", "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-2025-40324", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:59:24.014444Z", "version": "2.0.3"}}]}, "published": "2025-12-08T01:16:05.197", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03524ccff698d4a77d096ed529073d91f5edee5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2ac46606b2cc49e78d8e3d8f2685e79e9ba73020"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/375fdd8993cecc48afa359728a6e70b280dde1c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f244b773c63fa480c9a3bd1ae04f5272f285e89"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a4948875ed0599c037dc438c11891c9012721b1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/abb1f08a2121dd270193746e43b2a9373db9ad84"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: NFSD: Fix crash in nfsd4_read_release()", "id": "2419872", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419872"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSD: Fix crash in nfsd4_read_release()\nWhen tracing is enabled, the trace_nfsd_read_done trace point\ncrashes during the pynfs read.testNoFh test."], "name": "CVE-2025-40324", "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": "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": "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": "2025-12-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40324\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40324\nhttps://lore.kernel.org/linux-cve-announce/2025120824-CVE-2025-40324-a4cd@gregkh/T"], "threat_severity": "Moderate"}

{}