CVE-2026-98320
netfilter: flowtable: hold reference on ct until flow is released
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.
INFO
Published Date :
Oct. 6, 2026, 9:18 a.m.
Last Modified :
Oct. 6, 2026, 9:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Hold ct reference until flow is released.
- Add rcu_barrier() on module exit.
- Ensure pending flow entries are released.
- Apply kernel updates.
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-2026-98320.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-98320 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-2026-98320
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-2026-98320 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-98320 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
Oct. 06, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/98xxx/CVE-2026-98320.json">CVE-2026-98320</a> Added Reference https://git.kernel.org/stable/c/12c1ac230f4ca16e0017b62a963ab75e0b48074f Added Reference https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6 Added Reference https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25 Added Reference https://git.kernel.org/stable/c/93ff1594be1aad4da364462dd8db050ebcfda2de Added Reference https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc Added Reference https://git.kernel.org/stable/c/d9e6175a3ee48209ee65f294fc567b4e16b29b74 Added Reference https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d Added Reference https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c