linux-stable.git/drivers/net/usb, branch master

net: usb: asix: ax88772: re-add usbnet_link_change() in phylink callbacks

2026-05-05T02:04:15+00:00

Commit e0bffe3e6894 ("net: asix: ax88772: migrate to phylink") replaced
the asix_adjust_link() PHY callback with phylink's mac_link_up() and
mac_link_down() handlers, but did not carry over the usbnet_link_change()
notification that commit 805206e66fab ("net: asix: fix "can't send until
first packet is send" issue") had added.

As a result, the original symptom returns: when the link comes up,
usbnet is never notified, so the RX URB submission stays dormant until
some other event (e.g. a transmitted packet triggering the status
endpoint interrupt) wakes it up.

This is reproducible with the Apple A1277 USB Ethernet Adapter
(05ac:1402, AX88772A based) on a Banana Pro using a static IPv4
configuration. After bringing the interface up, no incoming packets are
received until the first outgoing frame triggers usbnet's RX path.

Restore the link change notification, gated on a carrier transition so
the call remains idempotent if the status endpoint also reports the
change later.

Fixes: e0bffe3e6894 ("net: asix: ax88772: migrate to phylink")
Signed-off-by: Markus Baier 
Tested-by: Oleksij Rempel 
Link: https://patch.msgid.link/20260501163941.107668-1-Markus.Baier@soslab.tu-darmstadt.de
Signed-off-by: Jakub Kicinski

net: usb: cdc_ncm: add Apple Mac USB-C direct networking quirk

2026-05-02T00:17:27+00:00

Apple Silicon Macs expose two CDC NCM "private" data interfaces over
USB-C with VID:PID 0x05ac:0x1905 and product string "Mac". This is the
same protocol Apple already ships on iPhone (0x05ac:0x12a8) and iPad
(0x05ac:0x12ab) for RemoteXPC since iOS 17 -- both data interfaces lack
an interrupt status endpoint, so they rely on the FLAG_LINK_INTR-
conditional bind path introduced in commit 3ec8d7572a69 ("CDC-NCM: add
support for Apple's private interface").

The id_table currently has entries for iPhone and iPad but not for the
Mac. Without a match, cdc_ncm falls through to the generic CDC NCM
class-match entry, which uses the FLAG_LINK_INTR-having cdc_ncm_info
struct, so bind_common() fails on the missing status endpoint and no
netdev appears.

Add id_table entries for both interface numbers (0 and 2) of the Mac,
bound to the existing apple_private_interface_info driver_info.

Verified empirically on a Mac Studio M3 Ultra running macOS 26.5: when
a Mac is connected via USB-C, ioreg shows VID 0x05ac, PID 0x1905,
product string "Mac", with two NCM data interfaces at numbers 0 and 2.
The same PID is presented by all current Apple Silicon Mac models
(MacBook Pro/Air, Mac mini, Mac Studio across the M-series), mirroring
Apple's single-PID-per-family pattern from iPhone/iPad.

After this patch, plugging a Mac into a Linux host running the patched
kernel produces two enx... interfaces (one per data interface),
"ip -br link" lists them as UP, and standard userspace networking
(DHCP, NetworkManager shared mode, etc.) works without any modprobe
overrides or out-of-tree modules.

Signed-off-by: Alex Cheema 
Reviewed-by: Simon Horman 
Link: https://patch.msgid.link/20260429175739.34426-1-alex@exolabs.net
Signed-off-by: Jakub Kicinski

net: usb: r8152: add TRENDnet TUC-ET2G v2.0

2026-05-01T23:50:49+00:00

The TRENDnet TUC-ET2G V2.0 is an RTL8156B based 2.5G Ethernet controller.

Add the vendor and product ID values to the driver. This makes Ethernet
work with the adapter.

Signed-off-by: Aleksander Jan Bajkowski 
Reviewed-by: Andrew Lunn 
Reviewed-by: Birger Koblitz 
Link: https://patch.msgid.link/20260430213435.21821-1-olek2@wp.pl
Signed-off-by: Jakub Kicinski

net: usb: rtl8150: free skb on usb_submit_urb() failure in xmit

2026-04-28T00:51:14+00:00

When rtl8150_start_xmit() fails to submit the tx URB, the URB is never
handed to the USB core and write_bulk_callback() will not run.  The
driver returns NETDEV_TX_OK, which tells the networking stack that the
skb has been consumed, but nothing actually frees the skb on this
error path:

  dev->tx_skb = skb;
  ...
  if ((res = usb_submit_urb(dev->tx_urb, GFP_ATOMIC))) {
          ...
          /* no kfree_skb here */
  }
  return NETDEV_TX_OK;

This leaks the skb on every submit failure and also leaves dev->tx_skb
pointing at memory that the driver itself may later free, which is
fragile.

Free the skb with dev_kfree_skb_any() in the error path and clear
dev->tx_skb so no stale pointer is left behind.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Andrew Lunn 
Signed-off-by: Morduan Zang 
Link: https://patch.msgid.link/E7D3E1C013C5A859+20260424015517.9574-1-zhangdandan@uniontech.com
Signed-off-by: Jakub Kicinski

net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()

2026-04-28T00:51:04+00:00

syzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()
when accessing skb->len for tx statistics after usb_submit_urb() has
been called:

  BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760
    drivers/net/usb/rtl8150.c:712
  Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226

The URB completion handler write_bulk_callback() frees the skb via
dev_kfree_skb_irq(dev->tx_skb). The URB may complete on another CPU
in softirq context before usb_submit_urb() returns in the submitter,
so by the time the submitter reads skb->len the skb has already been
queued to the per-CPU completion_queue and freed by net_tx_action():

  CPU A (xmit)                      CPU B (USB completion softirq)
  ------------                      ------------------------------
  dev->tx_skb = skb;
  usb_submit_urb()      --+
                          |-------> write_bulk_callback()
                          |           dev_kfree_skb_irq(dev->tx_skb)
                          |         net_tx_action()
                          |           napi_skb_cache_put()   <-- free
  netdev->stats.tx_bytes  |
    += skb->len;          <-- UAF read

Fix it by caching skb->len before submitting the URB and using the
cached value when updating the tx_bytes counter.

The pre-existing tx_bytes semantics are preserved: the counter tracks
the original frame length (skb->len), not the ETH_ZLEN/USB-alignment
padded "count" value that is handed to the device.  Changing that
would be a user-visible accounting change and is out of scope for
this UAF fix.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: syzbot+3f46c095ac0ca048cb71@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/69e69ee7.050a0220.24bfd3.002b.GAE@google.com/
Closes: https://syzkaller.appspot.com/bug?extid=3f46c095ac0ca048cb71
Reviewed-by: Andrew Lunn 
Signed-off-by: Zhan Jun 
Link: https://patch.msgid.link/809895186B866C10+20260423004913.136655-1-zhangdandan@uniontech.com
Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-04-14T19:04:00+00:00

Merge in late fixes in preparation for the net-next PR.

Conflicts:

include/net/sch_generic.h
  a6bd339dbb351 ("net_sched: fix skb memory leak in deferred qdisc drops")
  ff2998f29f390 ("net: sched: introduce qdisc-specific drop reason tracing")
https://lore.kernel.org/adz0iX85FHMz0HdO@sirena.org.uk

drivers/net/ethernet/airoha/airoha_eth.c
  1acdfbdb516b ("net: airoha: Fix VIP configuration for AN7583 SoC")
  bf3471e6e6c0 ("net: airoha: Make flow control source port mapping dependent on nbq parameter")

Adjacent changes:

drivers/net/ethernet/airoha/airoha_ppe.c
  f44218cd5e6a ("net: airoha: Reset PPE cpu port configuration in airoha_ppe_hw_init()")
  7da62262ec96 ("inet: add ip_local_port_step_width sysctl to improve port usage distribution")

Signed-off-by: Jakub Kicinski

net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

2026-04-14T10:05:01+00:00

A malicious USB device claiming to be a CDC Phonet modem can overflow
the skb_shared_info->frags[] array by sending an unbounded sequence of
full-page bulk transfers.

Drop the skb and increment the length error when the frag limit is
reached.  This matches the same fix that commit f0813bcd2d9d ("net:
wwan: t7xx: fix potential skb->frags overflow in RX path") did for the
t7xx driver.

Cc: Andrew Lunn 
Cc: "David S. Miller" 
Cc: Eric Dumazet 
Cc: Jakub Kicinski 
Cc: Paolo Abeni 
Cc: stable 
Assisted-by: gregkh_clanker_t1000
Signed-off-by: Greg Kroah-Hartman 
Link: https://patch.msgid.link/2026041134-dreamboat-buddhism-d1ec@gregkh
Fixes: 87cf65601e17 ("USB host CDC Phonet network interface driver")
Signed-off-by: Paolo Abeni

r8152: Add support for the RTL8157 hardware

2026-04-09T10:16:46+00:00

The RTL8157 uses a different packet descriptor format compared to the
previous generation of chips. Add support for this format by adding a
descriptor format structure into the r8152 structure and corresponding
desc_ops functions which abstract the vlan-tag, tx/rx len and
tx/rx checksum algorithms.

Also, add support for the ADV indirect access interface of the RTL8157
and PHY setup.

For initialization of the RTL8157, combine the existing RTL8156B and
RTL8156 init functions and add RTL8157-specific functinality in order
to improve code readability and maintainability.
r8156_init() is now called with RTL_VER_10 and RTL_VER_11 for the RTL8156,
with RTL_VER_12, RTL_VER_13 and RTL_VER_15 for the RTL8156B and with
RTL_VER_16 for the RTL8157 and checks the version for chip-specific code.
Also add USB power control functions for the RTL8157.

Add support for the USB device ID of Realtek RTL8157-based adapters. Detect
the RTL8157 as RTL_VER_16 and set it up.

Signed-off-by: Birger Koblitz 
Link: https://patch.msgid.link/20260404-rtl8157_next-v7-2-039121318f23@birger-koblitz.de
Signed-off-by: Paolo Abeni

r8152: Add support for 5Gbit Link Speeds and EEE

2026-04-09T10:16:46+00:00

The RTL8157 supports 5GBit Link speeds. Add support for this speed
in the setup and setting/getting through ethtool. Also add 5GBit EEE.
Add functionality for setup and ethtool get/set methods.

Signed-off-by: Birger Koblitz 
Link: https://patch.msgid.link/20260404-rtl8157_next-v7-1-039121318f23@birger-koblitz.de
Signed-off-by: Paolo Abeni

r8152: Add helper functions for SRAM2

2026-04-03T01:01:06+00:00

Add the following helper functions for SRAM2 access to simplify the code
and improve readability:

- sram2_write() - write data to SRAM2 address
- sram2_read() - read data from SRAM2 address
- sram2_write_w0w1() - read-modify-write operation

Signed-off-by: Chih Kai Hsu 
Reviewed-by: Hayes Wang 
Link: https://patch.msgid.link/20260401115542.34601-1-nic_swsd@realtek.com
Signed-off-by: Jakub Kicinski