{"id":"DEBIAN-CVE-2026-68117","details":"In the Linux kernel, the following vulnerability has been resolved:  tipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()  When tipc_sk_create() fails to insert the new socket (tipc_sk_insert() returns non-zero), its error path frees the sk with sk_free() but leaves sock-\u003esk pointing at the freed object:  \tif (tipc_sk_insert(tsk)) { \t\tsk_free(sk); \t\tpr_warn(\"Socket create failed; port number exhausted\\n\"); \t\treturn -EINVAL; \t}  This is harmless for plain socket(): the syscall layer clears sock-\u003eops before releasing, so tipc_release() is never called. It is not harmless on the accept() path. tipc_accept() creates the pre-allocated child socket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves new_sock-\u003esk dangling and new_sock-\u003eops non-NULL, and do_accept() then fput()s the new file, so __sock_release() -\u003e tipc_release() runs lock_sock(new_sock-\u003esk) on the freed sk -- a use-after-free write of the sk_lock spinlock.  tipc_release() already guards this exact \"failed accept() releases a pre-allocated child\" case with \"if (sk == NULL) return 0;\", but the guard is bypassed because tipc_sk_create() left sock-\u003esk non-NULL (dangling) rather than NULL.  Clear sock-\u003esk on the failed-insert path so the existing tipc_release() NULL check fires and the use-after-free is avoided.  The tipc_sk_insert() failure is reached when the per-netns socket rhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M elements) -- i.e. once a netns holds ~2M TIPC sockets every insert returns -E2BIG.    BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839)   Write of size 8 at addr ffff8880047cdc38 by task init/1    lock_sock_nested (net/core/sock.c:3839)    tipc_release (net/tipc/socket.c:638)    __sock_release (net/socket.c:710)    sock_close (net/socket.c:1501)    __fput (fs/file_table.c:512)   Allocated by task 1:    sk_alloc (net/core/sock.c:2308)    tipc_sk_create (net/tipc/socket.c:487)    tipc_accept (net/tipc/socket.c:2744)    do_accept (net/socket.c:2034)   Freed by task 1:    __sk_destruct (net/core/sock.c:2391)    tipc_sk_create (net/tipc/socket.c:504)    tipc_accept (net/tipc/socket.c:2744)    do_accept (net/socket.c:2034)","modified":"2026-09-14T17:03:29.061963116Z","published":"2026-08-10T13:19:56.690Z","upstream":["CVE-2026-68117"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-68117"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"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","6.1.180-1","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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