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:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HDebian
OSDebian11.0Linux Kernel
OSLinux2.6.126.175.16 – 6.1.151 (excl.)6.2 – 6.6.105 (excl.)2.6.12.1 – 5.4.299 (excl.)6.13 – 6.16.6 (excl.)6.7 – 6.12.46 (excl.)5.5 – 5.10.243 (excl.)5.11 – 5.15.192 (excl.)
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