{"id":"CVE-2025-21795","revision":null,"records":[{"revision":"10c897cd00694270b465de5eb6ac280a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21795","aliases":[],"title":"NFSD: fix hang in nfsd4_shutdown_callback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix hang in nfsd4_shutdown_callback\n\nIf nfs4_client is in courtesy state then there is no point to send\nthe callback. This causes nfsd4_shutdown_callback to hang since\ncl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP\nnotifies NFSD that the connection was dropped.\n\nThis patch modifies nfsd4_run_cb_work to skip the RPC call if\nnfs4_client is in courtesy state.","state":0,"publishedAt":"2025-02-27T02:18:31.538+00:00","modifiedAt":"2026-10-15T01:04:27.946+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/nfsd/nfs4callback.c\"\n ],\n \"versions\": [\n {\n \"version\": \"67ef9e5fd737eab2495f2586df7e9ea30caa1b77\",\n \"lessThan\": \"abed68027ea3ab893ac85cc46a00e2e64a324239\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"26540b8940a2e21582afa61a6fb8af87310bac72\",\n \"lessThan\": \"efa8a261c575f816c7e79a87aeb3ef8a0bd6b221\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"66af25799940b26efd41ea6e648f75c41a48a2c2\",\n \"lessThan\": \"38d345f612503b850c2973e5a879f88e441b34d7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"66af25799940b26efd41ea6e648f75c41a48a2c2\",\n \"lessThan\": \"23ad7797c74cd8f7f90617f1e59a8703e2b43908\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"66af25799940b26efd41ea6e648f75c41a48a2c2\",\n \"lessThan\": \"cedfbb92cf97a6bff3d25633001d9c44442ee854\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"66af25799940b26efd41ea6e648f75c41a48a2c2\",\n \"lessThan\": \"e88d2451cd42e025465d6b51fd716a47b0b3800d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"66af25799940b26efd41ea6e648f75c41a48a2c2\",\n \"lessThan\": \"036ac2778f7b28885814c6fbc07e156ad1624d03\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.220\",\n \"lessThan\": \"5.10.235\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.154\",\n \"lessThan\": \"5.15.179\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/nfsd/nfs4callback.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.235\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.179\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.129\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.79\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.16\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13.4\",\n \"lessThanOrEqual\": \"6.13.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239","https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221","https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7","https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908","https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854","https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d","https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21795","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21795","identifiers":["CVE-2025-21795"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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