CVE-2025-21716

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> vxlan: Fix uninit-value in vxlan_vnifilter_dump()<br /> <br /> KMSAN reported an uninit-value access in vxlan_vnifilter_dump() [1].<br /> <br /> If the length of the netlink message payload is less than<br /> sizeof(struct tunnel_msg), vxlan_vnifilter_dump() accesses bytes<br /> beyond the message. This can lead to uninit-value access. Fix this by<br /> returning an error in such situations.<br /> <br /> [1]<br /> BUG: KMSAN: uninit-value in vxlan_vnifilter_dump+0x328/0x920 drivers/net/vxlan/vxlan_vnifilter.c:422<br /> vxlan_vnifilter_dump+0x328/0x920 drivers/net/vxlan/vxlan_vnifilter.c:422<br /> rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6786<br /> netlink_dump+0x93e/0x15f0 net/netlink/af_netlink.c:2317<br /> __netlink_dump_start+0x716/0xd60 net/netlink/af_netlink.c:2432<br /> netlink_dump_start include/linux/netlink.h:340 [inline]<br /> rtnetlink_dump_start net/core/rtnetlink.c:6815 [inline]<br /> rtnetlink_rcv_msg+0x1256/0x14a0 net/core/rtnetlink.c:6882<br /> netlink_rcv_skb+0x467/0x660 net/netlink/af_netlink.c:2542<br /> rtnetlink_rcv+0x35/0x40 net/core/rtnetlink.c:6944<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]<br /> netlink_unicast+0xed6/0x1290 net/netlink/af_netlink.c:1347<br /> netlink_sendmsg+0x1092/0x1230 net/netlink/af_netlink.c:1891<br /> sock_sendmsg_nosec net/socket.c:711 [inline]<br /> __sock_sendmsg+0x330/0x3d0 net/socket.c:726<br /> ____sys_sendmsg+0x7f4/0xb50 net/socket.c:2583<br /> ___sys_sendmsg+0x271/0x3b0 net/socket.c:2637<br /> __sys_sendmsg net/socket.c:2669 [inline]<br /> __do_sys_sendmsg net/socket.c:2674 [inline]<br /> __se_sys_sendmsg net/socket.c:2672 [inline]<br /> __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2672<br /> x64_sys_call+0x3878/0x3d90 arch/x86/include/generated/asm/syscalls_64.h:47<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xd9/0x1d0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Uninit was created at:<br /> slab_post_alloc_hook mm/slub.c:4110 [inline]<br /> slab_alloc_node mm/slub.c:4153 [inline]<br /> kmem_cache_alloc_node_noprof+0x800/0xe80 mm/slub.c:4205<br /> kmalloc_reserve+0x13b/0x4b0 net/core/skbuff.c:587<br /> __alloc_skb+0x347/0x7d0 net/core/skbuff.c:678<br /> alloc_skb include/linux/skbuff.h:1323 [inline]<br /> netlink_alloc_large_skb+0xa5/0x280 net/netlink/af_netlink.c:1196<br /> netlink_sendmsg+0xac9/0x1230 net/netlink/af_netlink.c:1866<br /> sock_sendmsg_nosec net/socket.c:711 [inline]<br /> __sock_sendmsg+0x330/0x3d0 net/socket.c:726<br /> ____sys_sendmsg+0x7f4/0xb50 net/socket.c:2583<br /> ___sys_sendmsg+0x271/0x3b0 net/socket.c:2637<br /> __sys_sendmsg net/socket.c:2669 [inline]<br /> __do_sys_sendmsg net/socket.c:2674 [inline]<br /> __se_sys_sendmsg net/socket.c:2672 [inline]<br /> __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2672<br /> x64_sys_call+0x3878/0x3d90 arch/x86/include/generated/asm/syscalls_64.h:47<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xd9/0x1d0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> CPU: 0 UID: 0 PID: 30991 Comm: syz.4.10630 Not tainted 6.12.0-10694-gc44daa7e3c73 #29<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014