CVE-2021-47395

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mac80211: limit injected vht mcs/nss in ieee80211_parse_tx_radiotap<br /> <br /> Limit max values for vht mcs and nss in ieee80211_parse_tx_radiotap<br /> routine in order to fix the following warning reported by syzbot:<br /> <br /> WARNING: CPU: 0 PID: 10717 at include/net/mac80211.h:989 ieee80211_rate_set_vht include/net/mac80211.h:989 [inline]<br /> WARNING: CPU: 0 PID: 10717 at include/net/mac80211.h:989 ieee80211_parse_tx_radiotap+0x101e/0x12d0 net/mac80211/tx.c:2244<br /> Modules linked in:<br /> CPU: 0 PID: 10717 Comm: syz-executor.5 Not tainted 5.14.0-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011<br /> RIP: 0010:ieee80211_rate_set_vht include/net/mac80211.h:989 [inline]<br /> RIP: 0010:ieee80211_parse_tx_radiotap+0x101e/0x12d0 net/mac80211/tx.c:2244<br /> RSP: 0018:ffffc9000186f3e8 EFLAGS: 00010216<br /> RAX: 0000000000000618 RBX: ffff88804ef76500 RCX: ffffc900143a5000<br /> RDX: 0000000000040000 RSI: ffffffff888f478e RDI: 0000000000000003<br /> RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000100<br /> R10: ffffffff888f46f9 R11: 0000000000000000 R12: 00000000fffffff8<br /> R13: ffff88804ef7653c R14: 0000000000000001 R15: 0000000000000004<br /> FS: 00007fbf5718f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 0000001b2de23000 CR3: 000000006a671000 CR4: 00000000001506f0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600<br /> Call Trace:<br /> ieee80211_monitor_select_queue+0xa6/0x250 net/mac80211/iface.c:740<br /> netdev_core_pick_tx+0x169/0x2e0 net/core/dev.c:4089<br /> __dev_queue_xmit+0x6f9/0x3710 net/core/dev.c:4165<br /> __bpf_tx_skb net/core/filter.c:2114 [inline]<br /> __bpf_redirect_no_mac net/core/filter.c:2139 [inline]<br /> __bpf_redirect+0x5ba/0xd20 net/core/filter.c:2162<br /> ____bpf_clone_redirect net/core/filter.c:2429 [inline]<br /> bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2401<br /> bpf_prog_eeb6f53a69e5c6a2+0x59/0x234<br /> bpf_dispatcher_nop_func include/linux/bpf.h:717 [inline]<br /> __bpf_prog_run include/linux/filter.h:624 [inline]<br /> bpf_prog_run include/linux/filter.h:631 [inline]<br /> bpf_test_run+0x381/0xa30 net/bpf/test_run.c:119<br /> bpf_prog_test_run_skb+0xb84/0x1ee0 net/bpf/test_run.c:663<br /> bpf_prog_test_run kernel/bpf/syscall.c:3307 [inline]<br /> __sys_bpf+0x2137/0x5df0 kernel/bpf/syscall.c:4605<br /> __do_sys_bpf kernel/bpf/syscall.c:4691 [inline]<br /> __se_sys_bpf kernel/bpf/syscall.c:4689 [inline]<br /> __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4689<br /> do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80<br /> entry_SYSCALL_64_after_hwframe+0x44/0xae<br /> RIP: 0033:0x4665f9