{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40324", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.186Z", "datePublished": "2025-12-08T00:46:51.912Z", "dateUpdated": "2026-08-05T12:09:37.288Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:37.288Z" }, "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." } ], "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 bug is in the in-kernel NFS server's NFSv4 COMPOUND processing, triggered entirely by attacker-supplied RPC data arriving on TCP port 2049. No local access is needed — 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 — 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 — 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": "15a8b55dbb1ba154d82627547c5761cac884d810", "lessThan": "a4948875ed0599c037dc438c11891c9012721b1d", "status": "affected", "versionType": "git" }, { "version": "15a8b55dbb1ba154d82627547c5761cac884d810", "lessThan": "8f244b773c63fa480c9a3bd1ae04f5272f285e89", "status": "affected", "versionType": "git" }, { "version": "15a8b55dbb1ba154d82627547c5761cac884d810", "lessThan": "abb1f08a2121dd270193746e43b2a9373db9ad84", "status": "affected", "versionType": "git" }, { "version": "3d0dcada384af22dec764c8374a2997870ec86ae", "status": "affected", "versionType": "git" }, { "version": "5.10.220", "lessThan": "5.10.247", "status": "affected", "versionType": "semver" }, { "version": "5.15.154", "lessThan": "5.15.197", "status": "affected", "versionType": "semver" }, { "version": "6.1.24", "lessThan": "6.1.159", "status": "affected", "versionType": "semver" }, { "version": "6.2.11", "lessThan": "6.3", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfsd/nfs4proc.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "5.10.220", "versionEndExcluding": "5.10.247" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.154", "versionEndExcluding": "5.15.197" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.24", "versionEndExcluding": "6.1.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.6.117" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.58" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.17.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.11" } ] } ] } ], "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" } ], "title": "NFSD: Fix crash in nfsd4_read_release()", "x_generator": { "engine": "bippy-1.2.0" } } } }