CVE-2024-26597

In the Linux kernel, the following vulnerability has been resolved: net:
qualcomm: rmnet: fix global oob in rmnet_policy The variable rmnet_link_ops
assign a bigger maxtype which leads to a global out-of-bounds read when
parsing the netlink attributes. See bug trace below:
================================================================== BUG:
KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:386 [inline] BUG:
KASAN: global-out-of-bounds in __nla_validate_parse+0x24af/0x2750
lib/nlattr.c:600 Read of size 1 at addr ffffffff92c438d0 by task
syz-executor.6/84207 CPU: 0 PID: 84207 Comm: syz-executor.6 Tainted: G N
6.1.0 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> __dump_stack
lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x172/0x475 mm/kasan/report.c:395 kasan_report+0xbb/0x1c0
mm/kasan/report.c:495 validate_nla lib/nlattr.c:386 [inline]
__nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600 __nla_parse+0x3e/0x50
lib/nlattr.c:697 nla_parse_nested_deprecated include/net/netlink.h:1248
[inline] __rtnl_newlink+0x50a/0x1880 net/core/rtnetlink.c:3485
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3594
rtnetlink_rcv_msg+0x43c/0xd70 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x14f/0x410 net/netlink/af_netlink.c:2540
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x54e/0x800 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x930/0xe50 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0x154/0x190
net/socket.c:734 ____sys_sendmsg+0x6df/0x840 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf3/0x1c0
net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdcf2072359 Code: 28
00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6
48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01
c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdcf13e3168
EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX:
00007fdcf219ff80 RCX: 00007fdcf2072359 RDX: 0000000000000000 RSI:
0000000020000200 RDI: 0000000000000003 RBP: 00007fdcf20bd493 R08:
0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11:
0000000000000246 R12: 0000000000000000 R13: 00007fffbb8d7bdf R14:
00007fdcf13e3300 R15: 0000000000022000 </TASK> The buggy address belongs to
the variable: rmnet_policy+0x30/0xe0 The buggy address belongs to the
physical page: page:0000000065bdeb3c refcount:1 mapcount:0
mapping:0000000000000000 index:0x0 pfn:0x155243 flags:
0x200000000001000(reserved|node=0|zone=2) raw: 0200000000001000
ffffea00055490c8 ffffea00055490c8 0000000000000000 raw: 0000000000000000
0000000000000000 00000001ffffffff 0000000000000000 page dumped because:
kasan: bad access detected Memory state around the buggy address:
ffffffff92c43780: f9 f9 f9 f9 00 00 00 02 f9 f9 f9 f9 00 00 00 07
ffffffff92c43800: f9 f9 f9 f9 00 00 00 05 f9 f9 f9 f9 06 f9 f9 f9
>ffffffff92c43880: f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 ^
ffffffff92c43900: 00 00 00 00 00 00 00 00 07 f9 f9 f9 f9 f9 f9 f9
ffffffff92c43980: 00 00 00 07 f9 f9 f9 f9 00 00 00 05 f9 f9 f9 f9 According
to the comment of nla_parse_nested_deprecated, the maxtype should be
len(destination array) - 1. Hence use IFLA_RMNET_MAX here.

Notes