CVE-2026-43016

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bpf: sockmap: Fix use-after-free of sk-&gt;sk_socket in sk_psock_verdict_data_ready().<br /> <br /> syzbot reported use-after-free of AF_UNIX socket&amp;#39;s sk-&gt;sk_socket<br /> in sk_psock_verdict_data_ready(). [0]<br /> <br /> In unix_stream_sendmsg(), the peer socket&amp;#39;s -&gt;sk_data_ready() is<br /> called after dropping its unix_state_lock().<br /> <br /> Although the sender socket holds the peer&amp;#39;s refcount, it does not<br /> prevent the peer&amp;#39;s sock_orphan(), and the peer&amp;#39;s sk_socket might<br /> be freed after one RCU grace period.<br /> <br /> Let&amp;#39;s fetch the peer&amp;#39;s sk-&gt;sk_socket and sk-&gt;sk_socket-&gt;ops under<br /> RCU in sk_psock_verdict_data_ready().<br /> <br /> [0]:<br /> BUG: KASAN: slab-use-after-free in sk_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278<br /> Read of size 8 at addr ffff8880594da860 by task syz.4.1842/11013<br /> <br /> CPU: 1 UID: 0 PID: 11013 Comm: syz.4.1842 Not tainted syzkaller #0 PREEMPT(full)<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026<br /> Call Trace:<br /> <br /> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120<br /> print_address_description mm/kasan/report.c:378 [inline]<br /> print_report+0xba/0x230 mm/kasan/report.c:482<br /> kasan_report+0x117/0x150 mm/kasan/report.c:595<br /> sk_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278<br /> unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2482<br /> sock_sendmsg_nosec net/socket.c:721 [inline]<br /> __sock_sendmsg net/socket.c:736 [inline]<br /> ____sys_sendmsg+0x972/0x9f0 net/socket.c:2585<br /> ___sys_sendmsg+0x2a5/0x360 net/socket.c:2639<br /> __sys_sendmsg net/socket.c:2671 [inline]<br /> __do_sys_sendmsg net/socket.c:2676 [inline]<br /> __se_sys_sendmsg net/socket.c:2674 [inline]<br /> __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2674<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> RIP: 0033:0x7facf899c819<br /> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48<br /> RSP: 002b:00007facf9827028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e<br /> RAX: ffffffffffffffda RBX: 00007facf8c15fa0 RCX: 00007facf899c819<br /> RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004<br /> RBP: 00007facf8a32c91 R08: 0000000000000000 R09: 0000000000000000<br /> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000<br /> R13: 00007facf8c16038 R14: 00007facf8c15fa0 R15: 00007ffd41b01c78<br /> <br /> <br /> Allocated by task 11013:<br /> kasan_save_stack mm/kasan/common.c:57 [inline]<br /> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78<br /> unpoison_slab_object mm/kasan/common.c:340 [inline]<br /> __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366<br /> kasan_slab_alloc include/linux/kasan.h:253 [inline]<br /> slab_post_alloc_hook mm/slub.c:4538 [inline]<br /> slab_alloc_node mm/slub.c:4866 [inline]<br /> kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4885<br /> sock_alloc_inode+0x28/0xc0 net/socket.c:316<br /> alloc_inode+0x6a/0x1b0 fs/inode.c:347<br /> new_inode_pseudo include/linux/fs.h:3003 [inline]<br /> sock_alloc net/socket.c:631 [inline]<br /> __sock_create+0x12d/0x9d0 net/socket.c:1562<br /> sock_create net/socket.c:1656 [inline]<br /> __sys_socketpair+0x1c4/0x560 net/socket.c:1803<br /> __do_sys_socketpair net/socket.c:1856 [inline]<br /> __se_sys_socketpair net/socket.c:1853 [inline]<br /> __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1853<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Freed by task 15:<br /> kasan_save_stack mm/kasan/common.c:57 [inline]<br /> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78<br /> kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584<br /> poison_slab_object mm/kasan/common.c:253 [inline]<br /> __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285<br /> kasan_slab_free include/linux/kasan.h:235 [inline]<br /> slab_free_hook mm/slub.c:2685 [inline]<br /> slab_free mm/slub.c:6165 [inline]<br /> kmem_cache_free+0x187/0x630 mm/slub.c:6295<br /> rcu_do_batch kernel/rcu/tree.c:<br /> ---truncated---