CVE-2025-21787

In the Linux kernel, the following vulnerability has been resolved:

team: better TEAM_OPTION_TYPE_STRING validation

syzbot reported following splat [1]

Make sure user-provided data contains one nul byte.

[1]

BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:633 [inline]

BUG: KMSAN: uninit-value in string+0x3ec/0x5f0 lib/vsprintf.c:714

string_nocheck lib/vsprintf.c:633 [inline]

string+0x3ec/0x5f0 lib/vsprintf.c:714

vsnprintf+0xa5d/0x1960 lib/vsprintf.c:2843

__request_module+0x252/0x9f0 kernel/module/kmod.c:149

team_mode_get drivers/net/team/team_core.c:480 [inline]

team_change_mode drivers/net/team/team_core.c:607 [inline]

team_mode_option_set+0x437/0x970 drivers/net/team/team_core.c:1401

team_option_set drivers/net/team/team_core.c:375 [inline]

team_nl_options_set_doit+0x1339/0x1f90 drivers/net/team/team_core.c:2662

genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]

genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]

genl_rcv_msg+0x1214/0x12c0 net/netlink/genetlink.c:1210

netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2543

genl_rcv+0x40/0x60 net/netlink/genetlink.c:1219

netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]

netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1348

netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1892

sock_sendmsg_nosec net/socket.c:718 [inline]

__sock_sendmsg+0x30f/0x380 net/socket.c:733

____sys_sendmsg+0x877/0xb60 net/socket.c:2573

___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627

__sys_sendmsg net/socket.c:2659 [inline]

__do_sys_sendmsg net/socket.c:2664 [inline]

__se_sys_sendmsg net/socket.c:2662 [inline]

__x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662

x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f