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Linux Kernel CVE-2025-38377

HIGH
Use After Free (CWE-416)
2025-07-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Use After Free Memory Corruption Debian Red Hat Debian Linux Suse
7.8
CVSS 3.1 · NVD
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Severity by source

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

Local-only kernel UAF (AV:L) reachable by a low-privileged local user with ROSE device-config rights (PR:L), no user interaction, yielding full memory-corruption impact (C/I/A:H).

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:25 vuln.today
CVE Published
Jul 25, 2025 - 13:15 nvd
HIGH 7.8

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

rose: fix dangling neighbour pointers in rose_rt_device_down()

There are two bugs in rose_rt_device_down() that can cause use-after-free:

  1. The loop bound t->count is modified within the loop, which can

cause the loop to terminate early and miss some entries.

  1. When removing an entry from the neighbour array, the subsequent entries

are moved up to fill the gap, but the loop index i is still incremented, causing the next entry to be skipped.

For example, if a node has three neighbours (A, A, B) with count=3 and A is being removed, the second A is not checked.

i=0: (A, A, B) -> (A, B) with count=2 ^ checked i=1: (A, B) -> (A, B) with count=2 ^ checked (B, not A!) i=2: (doesn't occur because i < count is false)

This leaves the second A in the array with count=2, but the rose_neigh structure has been freed. Code that accesses these entries assumes that the first count entries are valid pointers, causing a use-after-free when it accesses the dangling pointer.

Fix both issues by iterating over the array in reverse order with a fixed loop bound. This ensures that all entries are examined and that the removal of an entry doesn't affect subsequent iterations.

AnalysisAI

Local privilege escalation via use-after-free in the Linux kernel's ROSE (amateur-radio X.25 PLP) networking stack, where rose_rt_device_down() mishandles neighbour-array compaction and leaves dangling rose_neigh pointers. A local attacker able to manipulate ROSE routing/devices can trigger access to freed kernel memory (CWE-416), enabling memory corruption that can lead to full compromise (confidentiality, integrity, and availability all High). No public exploit identified at time of analysis; EPSS is very low at 0.16% (6th percentile) and it is not on CISA KEV.

Technical ContextAI

ROSE is the kernel implementation of the amateur-radio ROSE/X.25 packet-switching protocol (net/rose), built on the AX.25 stack and compiled via CONFIG_ROSE. The bug is in rose_rt_device_down(), which walks a fixed-size neighbour array on each routing node when a network device goes down. Two defects combine into a use-after-free (CWE-416): the loop bound t->count is decremented inside the loop causing early termination, and after an entry is removed and later entries are shifted up to fill the gap, the index i is still incremented, skipping the shifted-in entry. As the description illustrates with neighbours (A, A, B), the second A is never examined and remains in the array as a dangling pointer to an already-freed rose_neigh structure; subsequent code that trusts the first count entries then dereferences freed memory. The fix iterates the array in reverse with a fixed bound so removals do not perturb unvisited indices.

RemediationAI

Patch available per vendor advisory: apply the kernel update from your distribution or upstream stable trees; the upstream fix is carried in the eight referenced kernel.org stable commits (e.g. https://git.kernel.org/stable/c/2b952dbb32fef835756f07ff0cd77efbb836dfea) and shipped for Debian via the debian-lts announcements (https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html). Because published data points to stable commits/backports rather than a single tagged mainline release, confirm the exact fixed package version for your kernel branch with your distribution before deployment. If you cannot patch immediately and do not use amateur-radio networking, the most effective compensating control is to remove the attack surface entirely: prevent the ROSE module from loading via a modprobe blacklist plus 'install rose /bin/true' (side effect: ROSE/AX.25 networking becomes unavailable, which is acceptable on virtually all systems), or rebuild without CONFIG_ROSE. Where ROSE must remain enabled, restrict CAP_NET_ADMIN and the ability to reconfigure ROSE devices/routes to trusted operators only (side effect: constrains legitimate network administration).

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Vendor StatusVendor

SUSE

Severity: Important
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
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-CHOST-BYOS-Aliyun Image SLES-CHOST-BYOS-Azure Image SLES-CHOST-BYOS-EC2 Image SLES-CHOST-BYOS-GCE Image SLES-CHOST-BYOS-GDC Image SLES-CHOST-BYOS-SAP-CCloud Image SLES-EC2 Image SLES-EC2-ECS Image SLES-GCE Image SLES-GCE-3P Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected

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CVE-2025-38377 vulnerability details – vuln.today
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