CVE-2026-93288
Published: September 26, 2026Last modified: October 6, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.189-r0) |
| 25 LTS | linux-lts | Fixed (6.12.111-r0) | |
| Stream | linux-lts | Fixed (6.18.53-r0) |
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