CVE-2025-38460 Details
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().
A potential null pointer dereference vulnerability has been identified in the Linux kernel's ATM clip subsystem. The issue arises in the to_atmarpd function, which is called without proper protection, leading to a risk of dereferencing a null pointer. This vulnerability is particularly concerning because it can be triggered by the clip_neigh_solicit function, which operates in an unsleepable context. The problem has been addressed by introducing a private mutex and RCU (Read-Copy-Update) mechanism to safeguard access to the atmarpd variable, ensuring that the function can be called safely without risking a null pointer dereference.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for upgrading the kernel can be found in the official Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/06935c50cfa3ac57cce80bba67b6d38ec1406e92 | kernel.org | Patch |
| https://git.kernel.org/stable/c/3251ce3979f41bd228f77a7615f9dd616d06a110 | kernel.org | Patch |
| https://git.kernel.org/stable/c/36caab990b69ef4eec1d81c52a19f080b7daa059 | kernel.org | Patch |
| https://git.kernel.org/stable/c/706cc36477139c1616a9b2b96610a8bb520b7119 | kernel.org | Patch |
| https://git.kernel.org/stable/c/70eac9ba7ce25d99c1d99bbf4ddb058940f631f9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a4c5785feb979cd996a99cfaad8bf353b2e79301 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f58e4270c73e7f086322978d585ea67c8076ce49 | kernel.org | Patch |
| https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html | CVE | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html | CVE | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.13, < 5.4.296 >= 5.5, < 5.10.240 >= 5.11, < 5.15.189 >= 5.16, < 6.1.146 >= 6.2, < 6.6.99 >= 6.7, < 6.12.39 >= 6.13, < 6.15.7 2.6.12 - 2.6.12 rc2 2.6.12 rc3 2.6.12 rc4 2.6.12 rc5 6.16 rc1 6.16 rc2 6.16 rc3 6.16 rc4 6.16 rc5 |
CPE
Remediation
| |
| debian debian linux | 11.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Dec 22, 2025 | Initial Analysis | [email protected] |
| Nov 3, 2025 | CVE Modified | CVE |
| Jul 25, 2025 | New CVE Received | kernel.org |