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Vulnerability CVE-2024-42108
Published: 2024-07-30
| Description: |
In the Linux kernel, the following vulnerability has been resolved:
net: rswitch: Avoid use-after-free in rswitch_poll()
The use-after-free is actually in rswitch_tx_free(), which is inlined in
rswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the
same pointer, the skb is first freed using dev_kfree_skb_any(), then the
value in skb->len is used to update the interface statistics.
Let's move around the instructions to use skb->len before the skb is
freed.
This bug is trivial to reproduce using KFENCE. It will trigger a splat
every few packets. A simple ARP request or ICMP echo request is enough. |
References: |
https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b
https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67
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