CVE-2025-39848

MEDIUM EPSS 4.5%
Published Sep 19, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 19, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ax25: properly unshare skbs in ax25_kiss_rcv() Bernard Pidoux reported a regression apparently caused by commit c353e8983e0d ("net: introduce per netns packet chains"). skb->dev becomes NULL and we crash in __netif_receive_skb_core(). Before above commit, different kind of bugs or corruptions could happen without a major crash. But the root cause is that ax25_kiss_rcv() can queue/mangle input skb without checking if this skb is shared or not. Many thanks to Bernard Pidoux for his help, diagnosis and tests. We had a similar issue years ago fixed with commit 7aaed57c5c28 ("phonet: properly unshare skbs in phonet_rcv()").

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 17

VendorProductVersionRange
linuxlinux_kernel*≥2.6.12.1  –  <5.4.299
linuxlinux_kernel*≥5.5  –  <5.10.243
linuxlinux_kernel*≥5.11  –  <5.15.192
linuxlinux_kernel*≥5.16  –  <6.1.151
linuxlinux_kernel*≥6.2  –  <6.6.105
linuxlinux_kernel*≥6.7  –  <6.12.46
linuxlinux_kernel*≥6.13  –  <6.16.6
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
debiandebian_linux11.0any

References 11

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • git.kernel.org https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17
    Patch