# CVE-2024-42108: linux: In the Linux kernel, the following vulnerability has been resolved:  net: rswitch: Avoid use-after-free in rswitch_po...

CVE-2024-42108 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42108, released July 30, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42108
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0063
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 30, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.9-1 | [DEBIAN-CVE-2024-42108](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42108.md) | Jul 30, 2024 |
| Linux | linux Debian 14 | 6.9.9-1 | [DEBIAN-CVE-2024-42108](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42108.md) | Jul 30, 2024 |

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