CVE-2024-42108: net: rswitch: Avoid use-after-free in rswitch_poll()
First published: Tue Jul 30 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.8<6.9.9 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b
- https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42108
- https://nvd.nist.gov/vuln/detail/CVE-2024-42108
- https://launchpad.net/bugs/cve/CVE-2024-42108
- https://security-tracker.debian.org/tracker/CVE-2024-42108
- https://ubuntu.com/security/CVE-2024-42108
- https://git.kernel.org/linus/9a0c28efeec6383ef22e97437616b920e7320b67
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