CVE-2026-23255

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

net: add proper RCU protection to /proc/net/ptype

Yin Fengwei reported an RCU stall in ptype_seq_show() and provided

a patch.

Real issue is that ptype_seq_next() and ptype_seq_show() violate

RCU rules.

ptype_seq_show() runs under rcu_read_lock(), and reads pt->dev

to get device name without any barrier.

At the same time, concurrent writers can remove a packet_type structure

(which is correctly freed after an RCU grace period) and clear pt->dev

without an RCU grace period.

Define ptype_iter_state to carry a dev pointer along seq_net_private:

struct ptype_iter_state {

struct seq_net_private p;

struct net_device *dev; // added in this patch

};

We need to record the device pointer in ptype_get_idx() and

ptype_seq_next() so that ptype_seq_show() is safe against

concurrent pt->dev changes.

We also need to add full RCU protection in ptype_seq_next().

(Missing READ_ONCE() when reading list.next values)

Many thanks to Dong Chenchen for providing a repro.