# CVE-2025-68787: netrom: Fix memory leak in nr_sendmsg()

CVE-2025-68787 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68787, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-68787
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 13, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68787

## 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/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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.162-1 | [DEBIAN-CVE-2025-68787](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68787.md) | Jan 13, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-68787](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68787.md) | Jan 13, 2026 |
| Linux | linux Debian 14 | 6.18.3-1 | [DEBIAN-CVE-2025-68787](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68787.md) | Jan 13, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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