CVE-2024-53210

/// Technical description

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

s390/iucv: MSG_PEEK causes memory leak in iucv_sock_destruct()

Passing MSG_PEEK flag to skb_recv_datagram() increments skb refcount

(skb->users) and iucv_sock_recvmsg() does not decrement skb refcount

at exit.

This results in skb memory leak in skb_queue_purge() and WARN_ON in

iucv_sock_destruct() during socket close. To fix this decrease

skb refcount by one if MSG_PEEK is set in order to prevent memory

leak and WARN_ON.

WARNING: CPU: 2 PID: 6292 at net/iucv/af_iucv.c:286 iucv_sock_destruct+0x144/0x1a0 [af_iucv]

CPU: 2 PID: 6292 Comm: afiucv_test_msg Kdump: loaded Tainted: G W 6.10.0-rc7 #1

Hardware name: IBM 3931 A01 704 (z/VM 7.3.0)

Call Trace:

[<001587c682c4aa98>] iucv_sock_destruct+0x148/0x1a0 [af_iucv]

[<001587c682c4a9d0>] iucv_sock_destruct+0x80/0x1a0 [af_iucv]

[<001587c704117a32>] __sk_destruct+0x52/0x550

[<001587c704104a54>] __sock_release+0xa4/0x230

[<

/// 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