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Linux Kernel CVE-2025-38460

MEDIUM
NULL Pointer Dereference (CWE-476)
2025-07-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Denial Of Service Linux Null Pointer Dereference Debian Red Hat Debian Linux Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
4.7 MEDIUM

AC:H reflects the race condition timing requirement between neighbor solicitation and atmarpd NULL state; all other metrics align with local low-privilege DoS-only impact.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
4.7 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:48 vuln.today
CVE Published
Jul 25, 2025 - 16:15 nvd
MEDIUM 5.5

DescriptionNVD

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().

AnalysisAI

NULL pointer dereference in the Linux kernel ATM CLIP subsystem's to_atmarpd() function causes local denial of service via kernel panic. Systems running the ATM CLIP networking subsystem are affected across a broad range of kernel versions dating back to 2.6.12. A local, low-privileged attacker can trigger the flaw by causing neighbor solicitation (clip_neigh_solicit) to invoke to_atmarpd() without the required RTNL lock, allowing a race window where atmarpd can be dereferenced while NULL or concurrently freed. No public exploit exists and EPSS is 0.16% (6th percentile), reflecting the niche deployment footprint of ATM networking.

Technical ContextAI

The ATM (Asynchronous Transfer Mode) CLIP (Classical IP over ATM) subsystem manages ARP resolution over ATM links via an ARP daemon pointer (atmarpd). Prior to the fix, atmarpd was protected only by the kernel RTNL (routing netlink) lock as established in commit f3a0592b37b8. However, to_atmarpd() is also called from the neigh_ops->solicit callback (clip_neigh_solicit), which executes in an unsleepable context and does not hold RTNL. This creates a race window where atmarpd can be NULL or concurrently freed while to_atmarpd() dereferences it, resulting in CWE-476 (NULL Pointer Dereference). The fix replaces the RTNL dependency with a private mutex combined with RCU (Read-Copy-Update) to safely protect the atmarpd pointer in both sleepable and unsleepable contexts. Affected CPE: cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* across numerous stable branches.

RemediationAI

Upstream fix is available via eight commits to Linux stable branches, covering multiple active kernel series. The patch commits are available at the kernel stable tree: git.kernel.org/stable/c/06935c50cfa3ac57cce80bba67b6d38ec1406e92, git.kernel.org/stable/c/3251ce3979f41bd228f77a7615f9dd616d06a110, git.kernel.org/stable/c/36caab990b69ef4eec1d81c52a19f080b7daa059, git.kernel.org/stable/c/706cc36477139c1616a9b2b96610a8bb520b7119, git.kernel.org/stable/c/70eac9ba7ce25d99c1d99bbf4ddb058940f631f9, git.kernel.org/stable/c/a4c5785feb979cd996a99cfaad8bf353b2e79301, git.kernel.org/stable/c/ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57, and git.kernel.org/stable/c/f58e4270c73e7f086322978d585ea67c8076ce49. Debian LTS users should apply the updates announced in the October 2025 advisories. As a workaround for systems where patching is not immediately possible, disabling or unloading the ATM CLIP kernel module (modprobe -r clip) eliminates the attack surface entirely with the trade-off of losing ATM CLIP networking functionality, which is likely acceptable given the rarity of ATM deployments. Exact patched kernel release versions per stable series are not independently confirmed from the available reference data.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.6.17.8.103 Image SLES15-SP6 Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-BYOS-GCE Image SLES15-SP6-CHOST-BYOS Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-EC2 Image SLES15-SP6-CHOST-BYOS-GCE Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-EC2 Image SLES15-SP6-EC2-ECS-HVM Image SLES15-SP6-GCE Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-BYOS-GCE Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-HPC-GCE Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-Hardened-BYOS-GCE Image SLES15-SP6-SAP Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAP-GCE Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP6-SAPCAL-EC2 Image SLES15-SP6-SAPCAL-GCE Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.44 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.67 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.76 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 Affected
Container suse/sle-micro-rancher/5.2:latest Image SLES15-SP3-Micro-5-2-BYOS-Azure Affected

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CVE-2025-38460 vulnerability details – vuln.today
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