CVE-2023-53147

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> xfrm: add NULL check in xfrm_update_ae_params<br /> <br /> Normally, x-&gt;replay_esn and x-&gt;preplay_esn should be allocated at<br /> xfrm_alloc_replay_state_esn(...) in xfrm_state_construct(...), hence the<br /> xfrm_update_ae_params(...) is okay to update them. However, the current<br /> implementation of xfrm_new_ae(...) allows a malicious user to directly<br /> dereference a NULL pointer and crash the kernel like below.<br /> <br /> BUG: kernel NULL pointer dereference, address: 0000000000000000<br /> PGD 8253067 P4D 8253067 PUD 8e0e067 PMD 0<br /> Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI<br /> CPU: 0 PID: 98 Comm: poc.npd Not tainted 6.4.0-rc7-00072-gdad9774deaf1 #8<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.o4<br /> RIP: 0010:memcpy_orig+0xad/0x140<br /> Code: e8 4c 89 5f e0 48 8d 7f e0 73 d2 83 c2 20 48 29 d6 48 29 d7 83 fa 10 72 34 4c 8b 06 4c 8b 4e 08 c<br /> RSP: 0018:ffff888008f57658 EFLAGS: 00000202<br /> RAX: 0000000000000000 RBX: ffff888008bd0000 RCX: ffffffff8238e571<br /> RDX: 0000000000000018 RSI: ffff888007f64844 RDI: 0000000000000000<br /> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000<br /> R10: 0000000000000000 R11: 0000000000000000 R12: ffff888008f57818<br /> R13: ffff888007f64aa4 R14: 0000000000000000 R15: 0000000000000000<br /> FS: 00000000014013c0(0000) GS:ffff88806d600000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 0000000000000000 CR3: 00000000054d8000 CR4: 00000000000006f0<br /> Call Trace:<br /> <br /> ? __die+0x1f/0x70<br /> ? page_fault_oops+0x1e8/0x500<br /> ? __pfx_is_prefetch.constprop.0+0x10/0x10<br /> ? __pfx_page_fault_oops+0x10/0x10<br /> ? _raw_spin_unlock_irqrestore+0x11/0x40<br /> ? fixup_exception+0x36/0x460<br /> ? _raw_spin_unlock_irqrestore+0x11/0x40<br /> ? exc_page_fault+0x5e/0xc0<br /> ? asm_exc_page_fault+0x26/0x30<br /> ? xfrm_update_ae_params+0xd1/0x260<br /> ? memcpy_orig+0xad/0x140<br /> ? __pfx__raw_spin_lock_bh+0x10/0x10<br /> xfrm_update_ae_params+0xe7/0x260<br /> xfrm_new_ae+0x298/0x4e0<br /> ? __pfx_xfrm_new_ae+0x10/0x10<br /> ? __pfx_xfrm_new_ae+0x10/0x10<br /> xfrm_user_rcv_msg+0x25a/0x410<br /> ? __pfx_xfrm_user_rcv_msg+0x10/0x10<br /> ? __alloc_skb+0xcf/0x210<br /> ? stack_trace_save+0x90/0xd0<br /> ? filter_irq_stacks+0x1c/0x70<br /> ? __stack_depot_save+0x39/0x4e0<br /> ? __kasan_slab_free+0x10a/0x190<br /> ? kmem_cache_free+0x9c/0x340<br /> ? netlink_recvmsg+0x23c/0x660<br /> ? sock_recvmsg+0xeb/0xf0<br /> ? __sys_recvfrom+0x13c/0x1f0<br /> ? __x64_sys_recvfrom+0x71/0x90<br /> ? do_syscall_64+0x3f/0x90<br /> ? entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> ? copyout+0x3e/0x50<br /> netlink_rcv_skb+0xd6/0x210<br /> ? __pfx_xfrm_user_rcv_msg+0x10/0x10<br /> ? __pfx_netlink_rcv_skb+0x10/0x10<br /> ? __pfx_sock_has_perm+0x10/0x10<br /> ? mutex_lock+0x8d/0xe0<br /> ? __pfx_mutex_lock+0x10/0x10<br /> xfrm_netlink_rcv+0x44/0x50<br /> netlink_unicast+0x36f/0x4c0<br /> ? __pfx_netlink_unicast+0x10/0x10<br /> ? netlink_recvmsg+0x500/0x660<br /> netlink_sendmsg+0x3b7/0x700<br /> <br /> This Null-ptr-deref bug is assigned CVE-2023-3772. And this commit<br /> adds additional NULL check in xfrm_update_ae_params to fix the NPD.