CVE-2025-39848

Kernel memory corruption via shared AX.25 buffers

Published Sep 19, 2025 · Updated Sep 19, 2025

Memory corruption in the Linux kernel allows remote attackers on an AX.25 link to crash systems by transmitting frames. ax25_kiss_rcv() queues and mutates a shared socket buffer without first unsharing it, allowing other consumers to observe corrupted state. Reachability requires an AX.25 station with an AF_PACKET monitor, and exploitation produces repeatable kernel panics and kernel-memory corruption.

CVSS severity8.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel allows remote attackers on an AX.25 link to crash systems by transmitting frames. ax25_kiss_rcv() queues and mutates a shared socket buffer without first unsharing it, allowing other consumers to observe corrupted state. Reachability requires an AX.25 station with an AF_PACKET monitor, and exploitation produces repeatable kernel panics and kernel-memory corruption.

The record

CVE
CVE-2025-39848
Published
Sep 19, 2025
Updated
Sep 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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 <01a2984cb803f2d487b7074f9718db2bf3531f69
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2bd0f67212908243ce88e35bf69fa77155b47b14
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42b46684e2c78ee052d8c2ee8d9c2089233c9094
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b079be1b9da49ad88fc304c874d4be7085f7883
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d449b7a6c8ee434d10a483feed7c5c50108cf56
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8156210d36a43e76372312c87eb5ea3dbb405a85
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89064cf534bea4bb28c83fe6bbb26657b19dd5fe
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1c71d674a308d2fbc83efcf88bfc4217a86aa17
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01a2984cb803f2d487b7074f9718db2bf3531f69; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2bd0f67212908243ce88e35bf69fa77155b47b14; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42b46684e2c78ee052d8c2ee8d9c2089233c9094; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b079be1b9da49ad88fc304c874d4be7085f7883; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d449b7a6c8ee434d10a483feed7c5c50108cf56; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8156210d36a43e76372312c87eb5ea3dbb405a85; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89064cf534bea4bb28c83fe6bbb26657b19dd5fe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1c71d674a308d2fbc83efcf88bfc4217a86aa17; version=2.6.12

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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