CVE-2025-39848 - ax25: properly unshare skbs in ax25_kiss_rcv()

CVE-2025-39848 - ax25: properly unshare skbs in ax25_kiss_rcv()

https://cvefeed.io/rssfeed/latest.atom / Fri, 09/19/2025 - 17:40
CVE ID : CVE-2025-39848
Published : Sept. 19, 2025, 3:26 p.m. | 13 minutes 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()").
Severity: 0.0 | NA
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