CVE-2025-68787

/// Technical description

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

netrom: Fix memory leak in nr_sendmsg()

syzbot reported a memory leak [1].

When function sock_alloc_send_skb() return NULL in nr_output(), the

original skb is not freed, which was allocated in nr_sendmsg(). Fix this

by freeing it before return.

[1]

BUG: memory leak

unreferenced object 0xffff888129f35500 (size 240):

comm "syz.0.17", pid 6119, jiffies 4294944652

hex dump (first 32 bytes):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

00 00 00 00 00 00 00 00 00 10 52 28 81 88 ff ff ..........R(....

backtrace (crc 1456a3e4):

kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]

slab_post_alloc_hook mm/slub.c:4983 [inline]

slab_alloc_node mm/slub.c:5288 [inline]

kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5340

__alloc_skb+0x203/0x240 net/core/skbuff.c:660

alloc_skb include/linux/skbuff.h:1383 [inline]

alloc_skb_with_frags+0x69/0x3f0 net/core/s

/// 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