CVE-2024-53042

Technical Description

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

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

There are code paths from which the function is called without holding

the RCU read lock, resulting in a suspicious RCU usage warning [1].

Fix by using l3mdev_master_upper_ifindex_by_index() which will acquire

the RCU read lock before calling

l3mdev_master_upper_ifindex_by_index_rcu().

[1]

WARNING: suspicious RCU usage

6.12.0-rc3-custom-gac8f72681cf2 #141 Not tainted

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

net/core/dev.c:876 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/361:

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

stack backtrace:

CPU: 3 UID: 0 PID: 361 Comm: ip Not tainted 6.12.0-rc3-custom-gac8f72681cf2 #141

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

Call Trace:

<TASK>

dump_stack_lvl+0xba/0x110

loc

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