{"id":"DEBIAN-CVE-2022-50555","details":"In the Linux kernel, the following vulnerability has been resolved:  tipc: fix a null-ptr-deref in tipc_topsrv_accept  syzbot found a crash in tipc_topsrv_accept:    KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]   Workqueue: tipc_rcv tipc_topsrv_accept   RIP: 0010:kernel_accept+0x22d/0x350 net/socket.c:3487   Call Trace:    \u003cTASK\u003e    tipc_topsrv_accept+0x197/0x280 net/tipc/topsrv.c:460    process_one_work+0x991/0x1610 kernel/workqueue.c:2289    worker_thread+0x665/0x1080 kernel/workqueue.c:2436    kthread+0x2e4/0x3a0 kernel/kthread.c:376    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306  It was caused by srv-\u003elistener that might be set to null by tipc_topsrv_stop() in net .exit whereas it's still used in tipc_topsrv_accept() worker.  srv-\u003elistener is protected by srv-\u003eidr_lock in tipc_topsrv_stop(), so add a check for srv-\u003elistener under srv-\u003eidr_lock in tipc_topsrv_accept() to avoid the null-ptr-deref. To ensure the lsock is not released during the tipc_topsrv_accept(), move sock_release() after tipc_topsrv_work_stop() where it's waiting until the tipc_topsrv_accept worker to be done.  Note that sk_callback_lock is used to protect sk-\u003esk_user_data instead of srv-\u003elistener, and it should check srv in tipc_topsrv_listener_data_ready() instead. This also ensures that no more tipc_topsrv_accept worker will be started after tipc_conn_close() is called in tipc_topsrv_stop() where it sets sk-\u003esk_user_data to null.","modified":"2026-09-01T16:05:35.705637895Z","published":"2025-10-07T16:15:43.850Z","upstream":["CVE-2022-50555"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50555"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50555.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50555.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50555.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}