CVE-2024-42108
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-42108
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-42108.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-42108
- Downstream
- Published
- 2024-07-30T08:15:03Z
- Modified
- 2025-08-09T20:01:27Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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 rswitchtxfree(), which is inlined in rswitchpoll(). Since
skbandgq->skbs[gq->dirty]are in fact the same pointer, the skb is first freed using devkfreeskbany(), 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