CVE-2024-42108
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().
Does this matter?
Lower severity and a low EPSS score (0.63%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.63% probability · 48th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/4a41bb9f2b402469d425a1c13359d3b3ea4e6403Patch
- https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58bPatch
- https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67Patch
- https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58bPatch
- https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.