netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state

{
  "id": "f175c6deb32b7b34243e27e670ffa23512ac0e835a3834a7bae5541666b2f862",
  "url": "https://osv.dev/vulnerability/CVE-2026-93288",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state",
    "summary": "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.",
    "evidence": "osv:CVE-2026-93288",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-93288",
      "aliases": [
        "CVE-2026-93288"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c83fa19603bdaeef17b815713dbbe3230c8a34ee"
                },
                {
                  "fixed": "ba2e246aa294f9acd86194ea87fb6834ed0a37ac"
                },
                {
                  "fixed": "5570d6c8b320dbcc602617ee08c27ce752fed65a"
                },
                {
                  "fixed": "3b9aa62d78ce80de47af2db472ff452398755213"
                },
                {
                  "fixed": "f4461654374576e9d5d0245fd534c46ad8509051"
                },
                {
                  "fixed": "dc20050b6b12ca58066715d088e1a537535d938d"
                },
                {
                  "fixed": "33d1469b0124cc0baaea7a2032123b77a81e0940"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93288.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.12.0"
                },
                {
                  "fixed": "5.15.222"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.189"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93288.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.096779966Z",
      "provider": "osv",
      "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",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93288.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93288",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93288.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93288",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497003,
  "published_at": "2026-09-24T16:02:12.144+00:00"
}