netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()

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Summary

CVECVE-2026-74695
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:44 UTC
Updated2026-08-22 16:16:44 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 12afa450a6a6c0cce2c42b7545a9958f62d8a00c git Not specified
CNA Linux Linux affected 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 538e67e8c7889cf5f93951f5309d1bcb41f86036 git Not specified
CNA Linux Linux affected 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 8aecf0bbcc72605592134c917c222207d8f63ab0 git Not specified
CNA Linux Linux affected b4b1adf2e66ecc7125c4117e7aad9ff61e2cfd27 git Not specified
CNA Linux Linux affected 209dedf806d31095968f54323dbe62525b077b33 git Not specified
CNA Linux Linux affected 4.16.15 4.17 semver Not specified
CNA Linux Linux affected 4.17.1 4.18 semver Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/538e67e8c7889cf5f93951f5309d1bcb41f86036 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8aecf0bbcc72605592134c917c222207d8f63ab0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12afa450a6a6c0cce2c42b7545a9958f62d8a00c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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