Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  bpf, sockmap: Take state lock for af_unix iter  When a BPF iterator program updates a sockmap, there is a race condition in unix_stream_bpf_update_proto() where the `peer` pointer can become stale[1] during a state transition TCP_ESTABLISHED -> TCP_CLOSE.          CPU0 bpf                          CPU1 close         --------                          ---------- // unix_stream_bpf_update_proto() sk_pair = unix_peer(sk) if (unlikely(!sk_pair))    return -EINVAL;                                      // unix_release_sock()                                      skpair = unix_peer(sk);                                      unix_peer(sk) = NULL;                                      sock_put(skpair) sock_hold(sk_pair) // UaF  More practically, this fix guarantees that the iterator program is consistently provided with a unix socket that remains stable during iterator execution.  [1]: BUG: KASAN: slab-use-after-free in unix_stream_bpf_update_proto+0x155/0x490 Write of size 4 at addr ffff8881178c9a00 by task test_progs/2231 Call Trace:  dump_stack_lvl+0x5d/0x80  print_report+0x170/0x4f3  kasan_report+0xe4/0x1c0  kasan_check_range+0x125/0x200  unix_stream_bpf_update_proto+0x155/0x490  sock_map_link+0x71c/0xec0  sock_map_update_common+0xbc/0x600  sock_map_update_elem+0x19a/0x1f0  bpf_prog_bbbf56096cdd4f01_selective_dump_unix+0x20c/0x217  bpf_iter_run_prog+0x21e/0xae0  bpf_iter_unix_seq_show+0x1e0/0x2a0  bpf_seq_read+0x42c/0x10d0  vfs_read+0x171/0xb20  ksys_read+0xff/0x200  do_syscall_64+0xf7/0x5e0  entry_SYSCALL_64_after_hwframe+0x76/0x7e  Allocated by task 2236:  kasan_save_stack+0x30/0x50  kasan_save_track+0x14/0x30  __kasan_slab_alloc+0x63/0x80  kmem_cache_alloc_noprof+0x1d5/0x680  sk_prot_alloc+0x59/0x210  sk_alloc+0x34/0x470  unix_create1+0x86/0x8a0  unix_stream_connect+0x318/0x15b0  __sys_connect+0xfd/0x130  __x64_sys_connect+0x72/0xd0  do_syscall_64+0xf7/0x5e0  entry_SYSCALL_64_after_hwframe+0x76/0x7e  Freed by task 2236:  kasan_save_stack+0x30/0x50  kasan_save_track+0x14/0x30  kasan_save_free_info+0x3b/0x70  __kasan_slab_free+0x47/0x70  kmem_cache_free+0x11c/0x590  __sk_destruct+0x432/0x6e0  unix_release_sock+0x9b3/0xf60  unix_release+0x8a/0xf0  __sock_release+0xb0/0x270  sock_close+0x18/0x20  __fput+0x36e/0xac0  fput_close_sync+0xe5/0x1a0  __x64_sys_close+0x7d/0xd0  do_syscall_64+0xf7/0x5e0  entry_SYSCALL_64_after_hwframe+0x76/0x7e

CVEs

• CVE-2026-53033