CVE-2025-39908

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

net: dev_ioctl: take ops lock in hwtstamp lower paths

ndo hwtstamp callbacks are expected to run under the per-device ops

lock. Make the lower get/set paths consistent with the rest of ndo

invocations.

Kernel log:

WARNING: CPU: 13 PID: 51364 at ./include/net/netdev_lock.h:70 __netdev_update_features+0x4bd/0xe60

...

RIP: 0010:__netdev_update_features+0x4bd/0xe60

...

Call Trace:

<TASK>

netdev_update_features+0x1f/0x60

mlx5_hwtstamp_set+0x181/0x290 [mlx5_core]

mlx5e_hwtstamp_set+0x19/0x30 [mlx5_core]

dev_set_hwtstamp_phylib+0x9f/0x220

dev_set_hwtstamp_phylib+0x9f/0x220

dev_set_hwtstamp+0x13d/0x240

dev_ioctl+0x12f/0x4b0

sock_ioctl+0x171/0x370

__x64_sys_ioctl+0x3f7/0x900

? __sys_setsockopt+0x69/0xb0

do_syscall_64+0x6f/0x2e0

entry_SYSCALL_64_after_hwframe+0x4b/0x53

...

</TASK>

....

---[ end trace 0000000000000000 ]---

Note that the mlx5_hwtstamp_set and mlx5e_hwtstamp_set functions shown

in the trace come from an in progress patch converting the legacy ioctl

to ndo_hwtstamp_get/set and are not present in mainline.