CVE-2026-93288
netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 24, 2026 |
| Last Updated | Oct 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
c83fa19603bdaeef17b815713dbbe3230c8a34ee < ba2e246aa294f9acd86194ea87fb6834ed0a37ac c83fa19603bdaeef17b815713dbbe3230c8a34ee < 5570d6c8b320dbcc602617ee08c27ce752fed65a c83fa19603bdaeef17b815713dbbe3230c8a34ee < 3b9aa62d78ce80de47af2db472ff452398755213 c83fa19603bdaeef17b815713dbbe3230c8a34ee < f4461654374576e9d5d0245fd534c46ad8509051 c83fa19603bdaeef17b815713dbbe3230c8a34ee < dc20050b6b12ca58066715d088e1a537535d938d c83fa19603bdaeef17b815713dbbe3230c8a34ee < 33d1469b0124cc0baaea7a2032123b77a81e0940
Linux / Linux
4.12
References
git.kernel.org: https://git.kernel.org/stable/c/ba2e246aa294f9acd86194ea87fb6834ed0a37ac git.kernel.org: https://git.kernel.org/stable/c/5570d6c8b320dbcc602617ee08c27ce752fed65a git.kernel.org: https://git.kernel.org/stable/c/3b9aa62d78ce80de47af2db472ff452398755213 git.kernel.org: https://git.kernel.org/stable/c/f4461654374576e9d5d0245fd534c46ad8509051 git.kernel.org: https://git.kernel.org/stable/c/dc20050b6b12ca58066715d088e1a537535d938d git.kernel.org: https://git.kernel.org/stable/c/33d1469b0124cc0baaea7a2032123b77a81e0940