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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
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Product Affected versions Fixed in
SIMATIC CN 4100 5.0 earliest → < 5.0 5.0

References

Timeline

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