CVE-2025-21708

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

net: usb: rtl8150: enable basic endpoint checking

Syzkaller reports [1] encountering a common issue of utilizing a wrong usb endpoint type during URB submitting stage. This, in turn, triggers a warning shown below.

For now, enable simple endpoint checking (specifically, bulk and interrupt eps, testing control one is not essential) to mitigate the issue with a view to do other related cosmetic changes later, if they are necessary.

[1] Syzkaller report: usb 1-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 1 PID: 2586 at drivers/usb/core/urb.c:503 usb_submit_urb+0xe4b/0x1730 driv> Modules linked in: CPU: 1 UID: 0 PID: 2586 Comm: dhcpcd Not tainted 6.11.0-rc4-syzkaller-00069-gfc88bb11617> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:usb_submit_urb+0xe4b/0x1730 drivers/usb/core/urb.c:503 Code: 84 3c 02 00 00 e8 05 e4 fc fc 4c 89 ef e8 fd 25 d7 fe 45 89 e0 89 e9 4c 89 f2 48 8> RSP: 0018:ffffc9000441f740 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff888112487a00 RCX: ffffffff811a99a9 RDX: ffff88810df6ba80 RSI: ffffffff811a99b6 RDI: 0000000000000001 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff8881023bf0a8 R14: ffff888112452a20 R15: ffff888112487a7c FS: 00007fc04eea5740(0000) GS:ffff8881f6300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0a1de9f870 CR3: 000000010dbd0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rtl8150_open+0x300/0xe30 drivers/net/usb/rtl8150.c:733 __dev_open+0x2d4/0x4e0 net/core/dev.c:1474 __dev_change_flags+0x561/0x720 net/core/dev.c:8838 dev_change_flags+0x8f/0x160 net/core/dev.c:8910 devinet_ioctl+0x127a/0x1f10 net/ipv4/devinet.c:1177 inet_ioctl+0x3aa/0x3f0 net/ipv4/af_inet.c:1003 sock_do_ioctl+0x116/0x280 net/socket.c:1222 sock_ioctl+0x22e/0x6c0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc04ef73d49 …

This change has not been tested on real hardware.

Affected Software

References

• https://git.kernel.org/stable/c/3c706829ceb6e347bd4ddfd17f1d3048acd69da2
• https://git.kernel.org/stable/c/431be4f78220d34ce21d67a6b843b7ca81bd82e9
• https://git.kernel.org/stable/c/8f78a2b9ed4cb1e62c60d0a8905d9a37bc18c20d
• https://git.kernel.org/stable/c/90b7f2961798793275b4844348619b622f983907
• https://git.kernel.org/stable/c/c843515ad2be7349dd6b60e5fd299d0da0b8458b
• https://git.kernel.org/stable/c/d42168f109f96b5d18812a789086015a435ee667
• https://git.kernel.org/stable/c/e10b392a7495a5dbbb25247e2c17d380d9899263
• https://git.kernel.org/stable/c/f395b7efcee8df54309eb2d4a624ef13f5d88b66
• https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html