CVE WatchJul 30, 2026

CVE-2025-39848

In the Linux kernel, the following vulnerability has been resolved: ax25: properly unshare skbs in ax25_kiss_rcv() Bernard Pidoux reported

CVSS

8.8

High

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Sep 19, 2025 · Last modified: Jul 30, 2026 · CWE-401

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-07-022026-07-29

Technical 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()").

Official references

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