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CVE-2025-38377 high CVSS 8.8

Use-After-Free in Linux kernel (CVE-2025-38377)

Summary

Vulnerability in Linux kernel (CVE-2025-38377). Successful exploitation can lead to full system takeover. Exploitable via count.

Original description

The description as published by the source.

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.

  2. 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.

Source: NIST National Vulnerability Database NVD

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2025-38377 has been found in Linux kernel.
Attackers can target a specific entry point like count over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2025-38377" on the vendor's site.

CVE-2025-38377 (Linux kernel) — CWE-416 / CVSS v3 8.8
Attack vector: adjacent-network / unauthenticated / no user interaction
Attack surface: count
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Use-after-free (CWE-416) exists in Linux kernel. Attackers reach the vulnerable code path via count without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel. Attack surface: count.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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