8.8
High
CVE-2025-39848 In the Linux kernel, the following vulnerability has been resolved: ax25: properly unshare skbs in ax25_kiss_rcv()…
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()").
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.17 | earliest → < 6.17 | 6.17 |
| Linux 6.16 | earliest → < 6.16.6 | 6.16.6 |
| Linux 6.12 | earliest → < 6.12.46 | 6.12.46 |
| Linux 6.6 | earliest → < 6.6.105 | 6.6.105 |
| Linux 6.1 | earliest → < 6.1.151 | 6.1.151 |
| Linux 5.15 | earliest → < 5.15.192 | 5.15.192 |
| Linux 5.10 | earliest → < 5.10.243 | 5.10.243 |
| Linux 5.4 | earliest → < 5.4.299 | 5.4.299 |
| Linux | 2.6.12 | No fix stated |
Show the other branch Hide the other branch
| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC CN 4100 5.0 | earliest → < 5.0 | 5.0 |
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