GHSA-56J7-MRX8-V649
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-25 06:30In 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": [],
"aliases": [
"CVE-2026-93288"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T17:17:10Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state\n\nsashiko reports: \"nfnl_log_net_exit() calls nf_log_unset(), which\nclears the logger pointer without an RCU grace period. Immediately after,\nops_free_list() frees the per-net state while concurrent packets might\nstill be executing nf_log_packet() under rcu_read_lock().\"\n\nClear the pointer via .pre_exit to make sure rcu readers have completed\nbefore pernet storage is free\u0027d. The change in nf_log_syslog.c is only\ndone for consistency: it doesn\u0027t use pernet data.",
"id": "GHSA-56j7-mrx8-v649",
"modified": "2026-09-25T06:30:29Z",
"published": "2026-09-24T18:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93288"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/33d1469b0124cc0baaea7a2032123b77a81e0940"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc20050b6b12ca58066715d088e1a537535d938d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f4461654374576e9d5d0245fd534c46ad8509051"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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