CVE-2023-53492

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netfilter: nf_tables: do not ignore genmask when looking up chain by id<br /> <br /> When adding a rule to a chain referring to its ID, if that chain had been<br /> deleted on the same batch, the rule might end up referring to a deleted<br /> chain.<br /> <br /> This will lead to a WARNING like following:<br /> <br /> [ 33.098431] ------------[ cut here ]------------<br /> [ 33.098678] WARNING: CPU: 5 PID: 69 at net/netfilter/nf_tables_api.c:2037 nf_tables_chain_destroy+0x23d/0x260<br /> [ 33.099217] Modules linked in:<br /> [ 33.099388] CPU: 5 PID: 69 Comm: kworker/5:1 Not tainted 6.4.0+ #409<br /> [ 33.099726] Workqueue: events nf_tables_trans_destroy_work<br /> [ 33.100018] RIP: 0010:nf_tables_chain_destroy+0x23d/0x260<br /> [ 33.100306] Code: 8b 7c 24 68 e8 64 9c ed fe 4c 89 e7 e8 5c 9c ed fe 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d 31 c0 89 c6 89 c7 c3 cc cc cc cc 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d 31 c0 89 c6 89 c7<br /> [ 33.101271] RSP: 0018:ffffc900004ffc48 EFLAGS: 00010202<br /> [ 33.101546] RAX: 0000000000000001 RBX: ffff888006fc0a28 RCX: 0000000000000000<br /> [ 33.101920] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000<br /> [ 33.102649] RBP: ffffc900004ffc78 R08: 0000000000000000 R09: 0000000000000000<br /> [ 33.103018] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880135ef500<br /> [ 33.103385] R13: 0000000000000000 R14: dead000000000122 R15: ffff888006fc0a10<br /> [ 33.103762] FS: 0000000000000000(0000) GS:ffff888024c80000(0000) knlGS:0000000000000000<br /> [ 33.104184] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> [ 33.104493] CR2: 00007fe863b56a50 CR3: 00000000124b0001 CR4: 0000000000770ee0<br /> [ 33.104872] PKRU: 55555554<br /> [ 33.104999] Call Trace:<br /> [ 33.105113] <br /> [ 33.105214] ? show_regs+0x72/0x90<br /> [ 33.105371] ? __warn+0xa5/0x210<br /> [ 33.105520] ? nf_tables_chain_destroy+0x23d/0x260<br /> [ 33.105732] ? report_bug+0x1f2/0x200<br /> [ 33.105902] ? handle_bug+0x46/0x90<br /> [ 33.106546] ? exc_invalid_op+0x19/0x50<br /> [ 33.106762] ? asm_exc_invalid_op+0x1b/0x20<br /> [ 33.106995] ? nf_tables_chain_destroy+0x23d/0x260<br /> [ 33.107249] ? nf_tables_chain_destroy+0x30/0x260<br /> [ 33.107506] nf_tables_trans_destroy_work+0x669/0x680<br /> [ 33.107782] ? mark_held_locks+0x28/0xa0<br /> [ 33.107996] ? __pfx_nf_tables_trans_destroy_work+0x10/0x10<br /> [ 33.108294] ? _raw_spin_unlock_irq+0x28/0x70<br /> [ 33.108538] process_one_work+0x68c/0xb70<br /> [ 33.108755] ? lock_acquire+0x17f/0x420<br /> [ 33.108977] ? __pfx_process_one_work+0x10/0x10<br /> [ 33.109218] ? do_raw_spin_lock+0x128/0x1d0<br /> [ 33.109435] ? _raw_spin_lock_irq+0x71/0x80<br /> [ 33.109634] worker_thread+0x2bd/0x700<br /> [ 33.109817] ? __pfx_worker_thread+0x10/0x10<br /> [ 33.110254] kthread+0x18b/0x1d0<br /> [ 33.110410] ? __pfx_kthread+0x10/0x10<br /> [ 33.110581] ret_from_fork+0x29/0x50<br /> [ 33.110757] <br /> [ 33.110866] irq event stamp: 1651<br /> [ 33.111017] hardirqs last enabled at (1659): [] __up_console_sem+0x79/0xa0<br /> [ 33.111379] hardirqs last disabled at (1666): [] __up_console_sem+0x5e/0xa0<br /> [ 33.111740] softirqs last enabled at (1616): [] __irq_exit_rcu+0x9e/0xe0<br /> [ 33.112094] softirqs last disabled at (1367): [] __irq_exit_rcu+0x9e/0xe0<br /> [ 33.112453] ---[ end trace 0000000000000000 ]---<br /> <br /> This is due to the nft_chain_lookup_byid ignoring the genmask. After this<br /> change, adding the new rule will fail as it will not find the chain.