{"id":"DEBIAN-CVE-2026-53399","details":"In the Linux kernel, the following vulnerability has been resolved:  nfsd: release layout stid on setlease failure  nfs4_alloc_stid() publishes the new stid into cl-\u003ecl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling idr_remove(), leaving the IDR slot pointing at freed slab memory. Any subsequent IDR walker (states_show, client teardown) dereferences the dangling pointer.  The correct teardown for an IDR-published stid is nfs4_put_stid(), which removes the IDR slot under cl_lock, dispatches sc_free (nfsd4_free_layout_stateid) to release ls-\u003els_file via nfsd4_close_layout(), and drops the nfs4_file reference in its tail.  A second issue blocks that switch: nfsd4_free_layout_stateid() unconditionally inspects ls-\u003els_fence_work via delayed_work_pending() under ls_lock, but INIT_DELAYED_WORK(&ls-\u003els_fence_work, ...) currently runs only after the setlease call. On the setlease-failure path the destructor would touch an uninitialized delayed_work.      nfsd4_alloc_layout_stateid()       nfs4_alloc_stid()           /* idr_alloc_cyclic under cl_lock */       nfsd4_layout_setlease()     /* fails */         nfs4_put_stid()           nfsd4_free_layout_stateid()             delayed_work_pending(&ls-\u003els_fence_work)  /* needs INIT */             nfsd4_close_layout()  /* nfsd_file_put(ls-\u003els_file) */           put_nfs4_file()  Fix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK initialization above the nfsd4_layout_setlease() call, and replace the manual nfsd_file_put + put_nfs4_file + kmem_cache_free cleanup with a single nfs4_put_stid(stp).","modified":"2026-09-01T16:06:50.390693004Z","published":"2026-07-19T12:16:51.063Z","upstream":["CVE-2026-53399"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-53399"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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