CVE-2026-74695
netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()
Description
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.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 22, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Drop existing dst_entry references with skb_dst_drop(skb).
- Set the non-referenced flowtable destination.
- Apply the fix for netfilter: nf_flow_table.
- Update the Linux kernel.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74695.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74695 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74695
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74695 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74695 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2a79fd3908acd88e6cb0e620c314d7b1fee56a02', 'lessThan': '12afa450a6a6c0cce2c42b7545a9958f62d8a00c', 'versionType': 'git'}, {'status': 'affected', 'version': '2a79fd3908acd88e6cb0e620c314d7b1fee56a02', 'lessThan': '538e67e8c7889cf5f93951f5309d1bcb41f86036', 'versionType': 'git'}, {'status': 'affected', 'version': '2a79fd3908acd88e6cb0e620c314d7b1fee56a02', 'lessThan': '8aecf0bbcc72605592134c917c222207d8f63ab0', 'versionType': 'git'}, {'status': 'affected', 'version': 'b4b1adf2e66ecc7125c4117e7aad9ff61e2cfd27', 'versionType': 'git'}, {'status': 'affected', 'version': '209dedf806d31095968f54323dbe62525b077b33', 'versionType': 'git'}, {'status': 'affected', 'version': '4.16.15', 'lessThan': '4.17', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.17.1', 'lessThan': '4.18', 'versionType': 'semver'}], 'programFiles': ['net/netfilter/nf_flow_table_ip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nf_flow_table_ip.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/12afa450a6a6c0cce2c42b7545a9958f62d8a00c Added Reference https://git.kernel.org/stable/c/538e67e8c7889cf5f93951f5309d1bcb41f86036 Added Reference https://git.kernel.org/stable/c/8aecf0bbcc72605592134c917c222207d8f63ab0