CVE-2024-42108
Linux Kernel use-after-free
- Published30 Jul 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.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
References
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2024-42108 being actively exploited?
CVE-2024-42108 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.63%.
How severe is CVE-2024-42108?
CVE-2024-42108 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.63% probability of exploitation.
Which products are affected by CVE-2024-42108?
Affected products include Linux Kernel.
How do I fix CVE-2024-42108?
Upgrade affected software to a fixed version, for example Linux Kernel 6.9.9 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2024-42108 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.