CVE Catalog

CVE-2026-74695

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.43%

35th percentile - higher than 35% of all known CVEs

Summary

In the Linux kernel, the netfilter nf_flow_table module has an issue with dst_entry reference leak. When a packet passing through flowtable hooks already has a ref-counted dst, calling skb_dst_set_noref() overwrites the pointer, causing a reference leak and triggering DEBUG_NET_WARN_ON_ONCE warnings.

Risk Assessment

The risk includes memory leaks and possible system crashes due to assertion violations, which could lead to kernel instability.

Recommendation

It is recommended to update the Linux kernel to a version containing the fix that calls skb_dst_drop() before setting the new dst.

Other vulnerabilities in Linux kernel

See all
Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref() Incoming skbs passing through netfilter flowtable offload hooks (or XFRM offload path) might already carry a ref-counted dst_entry assigned during earlier RX or routing steps. Calling skb_dst_set_noref() when skb already holds a ref-counted dst overwrites skb->_skb_refdst, leaking the previous dst_entry reference count and triggering a DEBUG_NET_WARN_ON_ONCE assertion in skb_dst_check_unset(): WARNING: at skb_dst_check_unset include/linux/skbuff.h:1170 WARNING: at skb_dst_set_noref include/linux/skbuff.h:1234 WARNING: at nf_flow_offload_ip_hook+0xf6c/0x2b60 net/netfilter/nf_flow_table_ip.c:864 Drop any existing dst_entry reference with skb_dst_drop(skb) before setting the non-referenced flowtable destination.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS