CVE-2024-57903

/// Technical description

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

net: restrict SO_REUSEPORT to inet sockets

After blamed commit, crypto sockets could accidentally be destroyed

from RCU call back, as spotted by zyzbot [1].

Trying to acquire a mutex in RCU callback is not allowed.

Restrict SO_REUSEPORT socket option to inet sockets.

v1 of this patch supported TCP, UDP and SCTP sockets,

but fcnal-test.sh test needed RAW and ICMP support.

[1]

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:562

in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 24, name: ksoftirqd/1

preempt_count: 100, expected: 0

RCU nest depth: 0, expected: 0

1 lock held by ksoftirqd/1/24:

#0: ffffffff8e937ba0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]

#0: ffffffff8e937ba0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2561 [inline]

#0: ffffffff8e937ba0 (rcu_callback){....}-{0:0}, at: rcu_core+0xa37/0x17a0 kernel/rc

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References