netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them (CVE-2026-74260) | HOL Guard CVE

High · CVSS 7.8CVE-2026-74260

netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them

Answer in brief

CVE-2026-74260 records a High severity (CVSS 7.8) vulnerability in netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=f37ad91270397a6d053e8623bdb3cf79859691d2 <edf234f71fb327792196f813048ab8f5bd3bb712 \|\| >=f37ad91270397a6d053e8623bdb3cf79859691d2 <2354e975932dabb06fad239f07a3b68fd1809737	edf234f71fb327792196f813048ab8f5bd3bb712, 2354e975932dabb06fad239f07a3b68fd1809737
Linux/Linuxgeneric	6.16	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to edf234f71fb327792196f813048ab8f5bd3bb712 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.