CVE-2025-39848

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()").

• Debian

  OS
  Debian
  11.0

• Linux Kernel

  OS
  Linux
  2.6.126.175.16 – 6.1.151 (bez)6.2 – 6.6.105 (bez)2.6.12.1 – 5.4.299 (bez)6.13 – 6.16.6 (bez)6.7 – 6.12.46 (bez)5.5 – 5.10.243 (bez)5.11 – 5.15.192 (bez)