CVE-2025-40087

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No local access to the server is required.\nAC:L - Triggering is fully deterministic \u2014 the attacker simply issues LAYOUTGET followed by LAYOUTCOMMIT with lc_layout_type=LAYOUT_FLEX_FILES, and the unconditional call through the NULL ops->proc_layoutcommit fires every time; there is no race, timing window, or memory-layout dependency.\nPR:N - With the default AUTH_SYS flavor nfsd performs no credential verification \u2014 the client asserts its own uid, and NFSD_MAY_OWNER_OVERRIDE in the fh_verify() check is satisfied by simply claiming the file owner's uid. Any host permitted to reach the export can drive the whole sequence without possessing credentials on the server.\nUI:N - The attacker performs the mount, session setup, LAYOUTGET and LAYOUTCOMMIT entirely on their own; no action by any user or administrator on the NFS server is needed once the export is online.\nS:U - The crash occurs in the nfsd kernel thread within the same security authority as the affected kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a call through a NULL function pointer, not a read of out-of-bounds or freed memory; no kernel data or pointer values are disclosed to the remote client.\nI:N - No memory is written and no control-flow hijack is achievable \u2014 the target address is 0, which cannot be mapped by a remote attacker, so no file or kernel data is modified.\nA:H - The NULL dereference produces a kernel oops that kills the nfsd service thread (full panic when panic_on_oops is set) and leaks the export/stateid references held by nfsd4_layoutcommit(), rendering the NFS server unavailable; it can be re-triggered at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/flexfilelayout.c"], "versions": [{"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "a75994dd879401c3e24ff51c2536559f1a53ea27", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "34d187e020cbda112a6c6f094f0ca5e6a8672b75", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "ba88a53d7f5df4191583abf214214efe0cda91d2", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "da9129ef77786839a3ccd1d7afeeab790bceaa1d", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "f7353208c91ab004e0179c5fb6c365b0f132f9f0", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "785ec512afa80d0540f2ca797c0e56de747a6083", "status": "affected", "versionType": "git"}, {"version": "9b9960a0ca4773e21c4b153ed355583946346b25", "lessThan": "4b47a8601b71ad98833b447d465592d847b4dc77", "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/flexfilelayout.c"], "versions": [{"version": "4.8", "status": "affected"}, {"version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.301", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.246", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.196", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.158", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.114", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.55", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.5", "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": "4.8", "versionEndExcluding": "5.4.301"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.10.246"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.196"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.17.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a75994dd879401c3e24ff51c2536559f1a53ea27"}, {"url": "https://git.kernel.org/stable/c/34d187e020cbda112a6c6f094f0ca5e6a8672b75"}, {"url": "https://git.kernel.org/stable/c/ba88a53d7f5df4191583abf214214efe0cda91d2"}, {"url": "https://git.kernel.org/stable/c/da9129ef77786839a3ccd1d7afeeab790bceaa1d"}, {"url": "https://git.kernel.org/stable/c/f7353208c91ab004e0179c5fb6c365b0f132f9f0"}, {"url": "https://git.kernel.org/stable/c/a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4"}, {"url": "https://git.kernel.org/stable/c/785ec512afa80d0540f2ca797c0e56de747a6083"}, {"url": "https://git.kernel.org/stable/c/4b47a8601b71ad98833b447d465592d847b4dc77"}], "title": "NFSD: Define a proc_layoutcommit for the FlexFiles layout type", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/flexfilelayout.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a75994dd879401c3e24ff51c2536559f1a53ea27", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "34d187e020cbda112a6c6f094f0ca5e6a8672b75", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "ba88a53d7f5df4191583abf214214efe0cda91d2", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "da9129ef77786839a3ccd1d7afeeab790bceaa1d", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "f7353208c91ab004e0179c5fb6c365b0f132f9f0", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "785ec512afa80d0540f2ca797c0e56de747a6083", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}, {"lessThan": "4b47a8601b71ad98833b447d465592d847b4dc77", "status": "affected", "version": "9b9960a0ca4773e21c4b153ed355583946346b25", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/flexfilelayout.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"lessThan": "4.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.301", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.246", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.196", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.158", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.114", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.55", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.5", "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: Define a proc_layoutcommit for the FlexFiles layout type\n\nAvoid a crash if a pNFS client should happen to send a LAYOUTCOMMIT\noperation on a FlexFiles layout."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nNFSD: Definir un proc_layoutcommit para el tipo de dise\u00f1o FlexFiles\n\nEvitar un fallo si un cliente pNFS llegara a enviar una operaci\u00f3n LAYOUTCOMMIT en un dise\u00f1o FlexFiles."}], "id": "CVE-2025-40087", "lastModified": "2026-10-19T21:10:00.160", "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"}]}, "published": "2025-10-30T10:15:33.230", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/34d187e020cbda112a6c6f094f0ca5e6a8672b75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b47a8601b71ad98833b447d465592d847b4dc77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/785ec512afa80d0540f2ca797c0e56de747a6083"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a75994dd879401c3e24ff51c2536559f1a53ea27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba88a53d7f5df4191583abf214214efe0cda91d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da9129ef77786839a3ccd1d7afeeab790bceaa1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f7353208c91ab004e0179c5fb6c365b0f132f9f0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: NFSD: Define a proc_layoutcommit for the FlexFiles layout type", "id": "2407346", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2407346"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-40087", "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": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-10-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40087\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40087\nhttps://lore.kernel.org/linux-cve-announce/2025103015-CVE-2025-40087-ff33@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-30T14:37:14.532299+00:00", "updated": "2025-10-30T14:37:14.532321+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}