What’s Vulnerable › Vulnerabilities

CVE-2022-49920: netfilter: nf_tables: netlink notifier might race to release objects

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-01 · updated 2026-08-04
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: netlink notifier might race to release objects commit release path is invoked via call_rcu and it runs lockless to release the objects after rcu grace period. The netlink notifier handler might win race to remove objects that the transaction context is still referencing from the commit release path. Call rcu_barrier() to ensure pending rcu callbacks run to completion if the list of transactions to be destroyed is not empty.

Affected products

• Linux kernel: from 5.12 before 5.15.78; from 5.16 before 6.0.8; 6.1-rc1, 6.1-rc2, 6.1-rc3 — fixed in 5.15.78, 6.0.8

How to fix

Upgrade to a fixed version: Linux kernel 5.15.78, 6.0.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1ffe7100411a8b9015115ce124cd6c9c9da6f8e3
• https://git.kernel.org/stable/c/d4bc8271db21ea9f1c86a1ca4d64999f184d4aae
• https://git.kernel.org/stable/c/e40b7c44d19e327ad8b49a491ef1fa8dcc4566e0

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