What’s Vulnerable › Vulnerabilities

CVE-2026-93288: netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state

• Severity: high (CVSS 7.8 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: 2026-09-24 · updated 2026-10-03

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state sashiko reports: "nfnl_log_net_exit() calls nf_log_unset(), which clears the logger pointer without an RCU grace period. Immediately after, ops_free_list() frees the per-net state while concurrent packets might still be executing nf_log_packet() under rcu_read_lock()." Clear the pointer via .pre_exit to make sure rcu readers have completed before pernet storage is free'd. The change in nf_log_syslog.c is only done for consistency: it doesn't use pernet data.

Affected products

• Linux kernel: 4.12 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/33d1469b0124cc0baaea7a2032123b77a81e0940
• https://git.kernel.org/stable/c/3b9aa62d78ce80de47af2db472ff452398755213
• https://git.kernel.org/stable/c/5570d6c8b320dbcc602617ee08c27ce752fed65a
• https://git.kernel.org/stable/c/ba2e246aa294f9acd86194ea87fb6834ed0a37ac
• https://git.kernel.org/stable/c/dc20050b6b12ca58066715d088e1a537535d938d
• https://git.kernel.org/stable/c/f4461654374576e9d5d0245fd534c46ad8509051

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