CVE-2026-98320 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/12c1ac230f4ca16e0017b62a963ab75e0b48074f https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6 https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25 https://git.kernel.org/stable/c/93ff1594be1aad4da364462dd8db050ebcfda2de https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc https://git.kernel.org/stable/c/d9e6175a3ee48209ee65f294fc567b4e16b29b74 https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c

Frequently Asked Questions

What is CVE-2026-98320? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-98320? +

CVE-2026-98320 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-98320? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-98320