CVE-2025-39827

Kernel memory corruption via split ROSE refcounts

Published Sep 16, 2025 · Updated Sep 16, 2025

Use-after-free in Linux kernel ROSE networking allows remote attackers to corrupt kernel memory through crafted ROSE frames from AX.25 peers. rose_node entries retain rose_neigh pointers without holding the same use refcount as sockets, so route or device teardown frees a neighbor while routes, nodes, or sockets still reference it. Reachability requires link-adjacent ROSE routing over radio, serial TNC, or local Ethernet; reuse can disclose or overwrite kernel memory and trigger an oops or panic.

CVSS severity8.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel ROSE networking allows remote attackers to corrupt kernel memory through crafted ROSE frames from AX.25 peers. rose_node entries retain rose_neigh pointers without holding the same use refcount as sockets, so route or device teardown frees a neighbor while routes, nodes, or sockets still reference it. Reachability requires link-adjacent ROSE routing over radio, serial TNC, or local Ethernet; reuse can disclose or overwrite kernel memory and trigger an oops or panic.

The record

CVE
CVE-2025-39827
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <384210cceb1873a4c8218b27ba0745444436b728
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4cce478c3e82a5fc788d72adb2f4c4e983997639
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c547c8eee9d1cf6e744611d688b9f725cf9a115
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7563b456ed44151e1a82091d96f60166daea89b
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da9c9c877597170b929a6121a68dcd3dd9a80f45
  6. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <384210cceb1873a4c8218b27ba0745444436b728; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4cce478c3e82a5fc788d72adb2f4c4e983997639; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c547c8eee9d1cf6e744611d688b9f725cf9a115; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7563b456ed44151e1a82091d96f60166daea89b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da9c9c877597170b929a6121a68dcd3dd9a80f45; version=2.6.12

Published CVSS scores

8.8LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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