CVE-2024-35962: netfilter: complete validation of user input

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-20 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: complete validation of user input In my recent commit, I missed that do_replace() handlers use copy_from_sockptr() (which I fixed), followed by unsafe copy_from_sockptr_offset() calls. In all functions, we can perform the @optlen validation before even calling xt_alloc_table_info() with the following check: if ((u64)optlen < (u64)tmp.size + sizeof(tmp)) return -EINVAL;

Affected products

Debian Linux: 10.0
Linux kernel: from 5.15.154 before 5.15.156; from 6.1.85 before 6.1.87; from 6.6.26 before 6.6.28; from 6.8.5 before 6.8.7; 5.10.215, 6.9-rc3 — fixed in 5.15.156, 6.1.87, 6.6.28, 6.8.7

How to fix

Upgrade to a fixed version: Linux kernel 5.15.156, 6.1.87, 6.6.28, 6.8.7. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-35962 or the next vulnerability affects your stack