CVE-2024-50128

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: wwan: fix global oob in wwan_rtnl_policy<br /> <br /> The variable wwan_rtnl_link_ops assign a *bigger* maxtype which leads to<br /> a global out-of-bounds read when parsing the netlink attributes. Exactly<br /> same bug cause as the oob fixed in commit b33fb5b801c6 ("net: qualcomm:<br /> rmnet: fix global oob in rmnet_policy").<br /> <br /> ==================================================================<br /> BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:388 [inline]<br /> BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x19d7/0x29a0 lib/nlattr.c:603<br /> Read of size 1 at addr ffffffff8b09cb60 by task syz.1.66276/323862<br /> <br /> CPU: 0 PID: 323862 Comm: syz.1.66276 Not tainted 6.1.70 #1<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:88 [inline]<br /> dump_stack_lvl+0x177/0x231 lib/dump_stack.c:106<br /> print_address_description mm/kasan/report.c:284 [inline]<br /> print_report+0x14f/0x750 mm/kasan/report.c:395<br /> kasan_report+0x139/0x170 mm/kasan/report.c:495<br /> validate_nla lib/nlattr.c:388 [inline]<br /> __nla_validate_parse+0x19d7/0x29a0 lib/nlattr.c:603<br /> __nla_parse+0x3c/0x50 lib/nlattr.c:700<br /> nla_parse_nested_deprecated include/net/netlink.h:1269 [inline]<br /> __rtnl_newlink net/core/rtnetlink.c:3514 [inline]<br /> rtnl_newlink+0x7bc/0x1fd0 net/core/rtnetlink.c:3623<br /> rtnetlink_rcv_msg+0x794/0xef0 net/core/rtnetlink.c:6122<br /> netlink_rcv_skb+0x1de/0x420 net/netlink/af_netlink.c:2508<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline]<br /> netlink_unicast+0x74b/0x8c0 net/netlink/af_netlink.c:1352<br /> netlink_sendmsg+0x882/0xb90 net/netlink/af_netlink.c:1874<br /> sock_sendmsg_nosec net/socket.c:716 [inline]<br /> __sock_sendmsg net/socket.c:728 [inline]<br /> ____sys_sendmsg+0x5cc/0x8f0 net/socket.c:2499<br /> ___sys_sendmsg+0x21c/0x290 net/socket.c:2553<br /> __sys_sendmsg net/socket.c:2582 [inline]<br /> __do_sys_sendmsg net/socket.c:2591 [inline]<br /> __se_sys_sendmsg+0x19e/0x270 net/socket.c:2589<br /> do_syscall_x64 arch/x86/entry/common.c:51 [inline]<br /> do_syscall_64+0x45/0x90 arch/x86/entry/common.c:81<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> RIP: 0033:0x7f67b19a24ad<br /> RSP: 002b:00007f67b17febb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e<br /> RAX: ffffffffffffffda RBX: 00007f67b1b45f80 RCX: 00007f67b19a24ad<br /> RDX: 0000000000000000 RSI: 0000000020005e40 RDI: 0000000000000004<br /> RBP: 00007f67b1a1e01d R08: 0000000000000000 R09: 0000000000000000<br /> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000<br /> R13: 00007ffd2513764f R14: 00007ffd251376e0 R15: 00007f67b17fed40<br /> <br /> <br /> The buggy address belongs to the variable:<br /> wwan_rtnl_policy+0x20/0x40<br /> <br /> The buggy address belongs to the physical page:<br /> page:ffffea00002c2700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xb09c<br /> flags: 0xfff00000001000(reserved|node=0|zone=1|lastcpupid=0x7ff)<br /> raw: 00fff00000001000 ffffea00002c2708 ffffea00002c2708 0000000000000000<br /> raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000<br /> page dumped because: kasan: bad access detected<br /> page_owner info is not present (never set?)<br /> <br /> Memory state around the buggy address:<br /> ffffffff8b09ca00: 05 f9 f9 f9 05 f9 f9 f9 00 01 f9 f9 00 01 f9 f9<br /> ffffffff8b09ca80: 00 00 00 05 f9 f9 f9 f9 00 00 03 f9 f9 f9 f9 f9<br /> &gt;ffffffff8b09cb00: 00 00 00 00 05 f9 f9 f9 00 00 00 00 f9 f9 f9 f9<br /> ^<br /> ffffffff8b09cb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00<br /> ==================================================================<br /> <br /> According to the comment of `nla_parse_nested_deprecated`, use correct size<br /> `IFLA_WWAN_MAX` here to fix this issue.