CVE-2026-74695 is a vulnerability in Linux Kernel
Published on August 22, 2026
netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()
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.
Products Associated with CVE-2026-74695
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Affected Versions
Linux:- Version 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 and below 12afa450a6a6c0cce2c42b7545a9958f62d8a00c is affected.
- Version 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 and below 538e67e8c7889cf5f93951f5309d1bcb41f86036 is affected.
- Version 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 and below 8aecf0bbcc72605592134c917c222207d8f63ab0 is affected.
- Version b4b1adf2e66ecc7125c4117e7aad9ff61e2cfd27 is affected.
- Version 209dedf806d31095968f54323dbe62525b077b33 is affected.
- Version 4.16.15 and below 4.17 is affected.
- Version 4.17.1 and below 4.18 is affected.
- Version 4.18 is affected.
- Before 4.18 is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.