CVE-2026-74260
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, the netfilter nf_dup_netdev module's nft_dup and nft_fwd functions have been updated to use the nf_dev_xmit_recursion() helpers. Additionally, bottom halves (BH) are disabled during skb transmission to prevent migration to a different CPU and imbalanced decrementation of recursion counters.
Risk Assessment
Without this patch, migration to another CPU during transmission can lead to unbalanced recursion counters and potential network issues, including system crashes.
Recommendation
Apply the Linux kernel patch that adds nf_dev_xmit_recursion() helpers and disables BH during transmission in nft_dup and nft_fwd.
Original NVD description (English source)
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.