CVE-2024-50304

Technical Description

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

ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_find()

The per-netns IP tunnel hash table is protected by the RTNL mutex and

ip_tunnel_find() is only called from the control path where the mutex is

taken.

Add a lockdep expression to hlist_for_each_entry_rcu() in

ip_tunnel_find() in order to validate that the mutex is held and to

silence the suspicious RCU usage warning [1].

[1]

WARNING: suspicious RCU usage

6.12.0-rc3-custom-gd95d9a31aceb #139 Not tainted

-----------------------------

net/ipv4/ip_tunnel.c:221 RCU-list traversed in non-reader section!!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1

1 lock held by ip/362:

#0: ffffffff86fc7cb0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x377/0xf60

stack backtrace:

CPU: 12 UID: 0 PID: 362 Comm: ip Not tainted 6.12.0-rc3-custom-gd95d9a31aceb #139

Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011

Call Trace:

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Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References