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CVE-2026-98899: netfilter: ipset: mark the rcu locked areas properly

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-26

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: mark the rcu locked areas properly When we bump the uref counter, there's no need to keep the rcu lock because the referred hash table can't disappear. Also, from the same reason in mtype_gc we need the rcu lock and not a spinlock.

Affected products

• Linux kernel: before 5.10.271; before 5.15.222; before 6.1.189; before 6.6.158; before 6.12.111; before 6.18.53 — fixed in 5.10.271, 5.15.222, 6.1.189, 6.12.111, 6.18.53, 6.6.158

How to fix

Upgrade to a fixed version: Linux kernel 5.10.271, 5.15.222, 6.1.189, 6.12.111. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0c46c9ce24130657ec7460c27fba5d445f5abd06
• https://git.kernel.org/stable/c/5d0c22e73656d050daffad10a2ba8765ce8441c8
• https://git.kernel.org/stable/c/67bd3d2350d17c2f4fb158c3f917c10b15ecbc94
• https://git.kernel.org/stable/c/892399abd1a005a455d5b74d86d82b9773405f2b
• https://git.kernel.org/stable/c/ca9fab1ca15534cef1630e81a479e94b3bbcdb6a
• https://git.kernel.org/stable/c/ecb48c6b9edc78de8dd456c365727ae14b88c1ee
• https://git.kernel.org/stable/c/eee5172741b2c0e73210020732043e5d589295d3

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