by Kastro
Paper/Archive/CVE-2024-42108

CVE-2024-42108

Linux Linux — net: rswitch: Avoid use-after-free in rswitch_poll()

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 50.3.503 × 2010.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linux0aeec4bb6a9fc963932bf3c929bdf27d835d44e9 – < 4a41bb9f2b402469d425a1c13359d3b3ea4e64034a41bb9f2b402469d425a1c13359d3b3ea4e6403CNA
Linux271e015b91535dd87fd0f5df0cc3b906c2eddef9 – < 92cbbe7759193e3418f38d0d73f8fe125312c58b92cbbe7759193e3418f38d0d73f8fe125312c58bCNA
Linux271e015b91535dd87fd0f5df0cc3b906c2eddef9 – < 9a0c28efeec6383ef22e97437616b920e7320b679a0c28efeec6383ef22e97437616b920e7320b67CNA
Linux6.86.9.9CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/4a41bb9f2b402469d425a1c13359d3b3ea4e6403refgit.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58brefgit.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67