---
id: CVE-2025-68787
title: 'netrom: Fix memory leak in nr_sendmsg()'
summary: |-
  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 fre…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    f77e538ac4e3adb1882d5bccb7bfdc111b5963d3
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    09efbf54eeaecebe882af603c9939a4b1bb9567e
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    73839497bbde5cd4fd02bbd9c8bc2640780ae65d
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    156a0f6341dce634a825db49ca20b48b1ae9bcc1
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    8d1ccba4b171cd504ecfa47349cb9864fc9d687c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    613d12dd794e078be8ff3cf6b62a6b9acf7f4619
  - Linux 2.6.12
published: '2026-01-13'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:43:28.878Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-68787'
references:
  - url: 'https://git.kernel.org/stable/c/f77e538ac4e3adb1882d5bccb7bfdc111b5963d3'
  - url: 'https://git.kernel.org/stable/c/09efbf54eeaecebe882af603c9939a4b1bb9567e'
  - url: 'https://git.kernel.org/stable/c/73839497bbde5cd4fd02bbd9c8bc2640780ae65d'
  - url: 'https://git.kernel.org/stable/c/156a0f6341dce634a825db49ca20b48b1ae9bcc1'
  - url: 'https://git.kernel.org/stable/c/8d1ccba4b171cd504ecfa47349cb9864fc9d687c'
  - url: 'https://git.kernel.org/stable/c/51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977'
  - url: 'https://git.kernel.org/stable/c/613d12dd794e078be8ff3cf6b62a6b9acf7f4619'
tags:
  - cve.org
epss: 0.00207
epssPercentile: 0.11105
ingestedAt: '2026-09-08T15:33:26.995Z'
---

## Overview

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/skbuff.c:6671
    sock_alloc_send_pskb+0x379/0x3e0 net/core/sock.c:2965
    sock_alloc_send_skb include/net/sock.h:1859 [inline]
    nr_sendmsg+0x287/0x450 net/netrom/af_netrom.c:1105
    sock_sendmsg_nosec net/socket.c:727 [inline]
    __sock_sendmsg net/socket.c:742 [inline]
    sock_write_iter+0x293/0x2a0 net/socket.c:1195
    new_sync_write fs/read_write.c:593 [inline]
    vfs_write+0x45d/0x710 fs/read_write.c:686
    ksys_write+0x143/0x170 fs/read_write.c:738
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f77e538ac4e3adb1882d5bccb7bfdc111b5963d3`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 09efbf54eeaecebe882af603c9939a4b1bb9567e`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 73839497bbde5cd4fd02bbd9c8bc2640780ae65d`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 156a0f6341dce634a825db49ca20b48b1ae9bcc1`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8d1ccba4b171cd504ecfa47349cb9864fc9d687c`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 613d12dd794e078be8ff3cf6b62a6b9acf7f4619`
- `Linux 2.6.12`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.