{"id":"CVE-2026-53399","revision":"05051519934e4832b568635917c52b7d","records":[{"revision":"05051519934e4832b568635917c52b7d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53399","aliases":[],"title":"nfsd: release layout stid on setlease failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: release layout stid on setlease failure\n\nnfs4_alloc_stid() publishes the new stid into cl->cl_stateids via\nidr_alloc_cyclic() under cl_lock before returning to\nnfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then\nfails, the error path frees the layout stateid directly with\nkmem_cache_free() without ever calling idr_remove(), leaving the\nIDR slot pointing at freed slab memory. Any subsequent IDR walker\n(states_show, client teardown) dereferences the dangling pointer.\n\nThe correct teardown for an IDR-published stid is nfs4_put_stid(),\nwhich removes the IDR slot under cl_lock, dispatches sc_free\n(nfsd4_free_layout_stateid) to release ls->ls_file via\nnfsd4_close_layout(), and drops the nfs4_file reference in its\ntail.\n\nA second issue blocks that switch: nfsd4_free_layout_stateid()\nunconditionally inspects ls->ls_fence_work via\ndelayed_work_pending() under ls_lock, but\nINIT_DELAYED_WORK(&ls->ls_fence_work, ...) currently runs only\nafter the setlease call. On the setlease-failure path the\ndestructor would touch an uninitialized delayed_work.\n\n    nfsd4_alloc_layout_stateid()\n      nfs4_alloc_stid()           /* idr_alloc_cyclic under cl_lock */\n      nfsd4_layout_setlease()     /* fails */\n        nfs4_put_stid()\n          nfsd4_free_layout_stateid()\n            delayed_work_pending(&ls->ls_fence_work)  /* needs INIT */\n            nfsd4_close_layout()  /* nfsd_file_put(ls->ls_file) */\n          put_nfs4_file()\n\nFix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK\ninitialization above the nfsd4_layout_setlease() call, and replace\nthe manual nfsd_file_put + put_nfs4_file + kmem_cache_free cleanup\nwith a single nfs4_put_stid(stp).","state":0,"publishedAt":"2026-07-19T12:02:00.055+00:00","modifiedAt":"2026-10-19T20:07:46.712+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/nfs4layouts.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"d788ef40a7517d22c97ab01700e4ae4c611b6f2f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"2e0a5d6d62600b8c614d1b55e50ef94035d6adf9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"7bbb7ce74051c8be4b69ff44ce3db370600dae61\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"48a586e382e4db1dbf958d44b63e081df5f8ed04\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"d369e5edfaaf83a448016e2f1da392b2174be801\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"83c2b7797742339bb768f83935f7ca33950db138\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5c707f96fc9a6e5a57ca5baac892673270abe3d\",\n                            \"lessThan\": \"30d55c8aabb261bc3f427d6b9aae7ef6206063f9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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/nfs4layouts.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.96\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.39\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.3\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\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:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/d788ef40a7517d22c97ab01700e4ae4c611b6f2f","https://git.kernel.org/stable/c/2e0a5d6d62600b8c614d1b55e50ef94035d6adf9","https://git.kernel.org/stable/c/7bbb7ce74051c8be4b69ff44ce3db370600dae61","https://git.kernel.org/stable/c/48a586e382e4db1dbf958d44b63e081df5f8ed04","https://git.kernel.org/stable/c/d369e5edfaaf83a448016e2f1da392b2174be801","https://git.kernel.org/stable/c/8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd","https://git.kernel.org/stable/c/83c2b7797742339bb768f83935f7ca33950db138","https://git.kernel.org/stable/c/30d55c8aabb261bc3f427d6b9aae7ef6206063f9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53399","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53399","identifiers":["CVE-2026-53399"]},"retained":false,"historicalAffected":[]}],"coverage":[]}