{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c71420db653aba30a234d1e4cf86dde376e604fa"
            },
            {
              "fixed": "2aa1789880fa5e41049b0f6a74a4fc2fa1997610"
            },
            {
              "fixed": "a03fceae0c65b31ce31840dac5e26684ceecb65b"
            },
            {
              "fixed": "aa2eb62525188269cdd402a583b9a8ed94657ff0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68409.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: defer link RX stats percpu free to RCU\n\nsta_remove_link() frees a removed MLO link's RX stats percpu buffer right\naway, but defers only the link container to RCU:\n\n\tsta_info_free_link(\u0026alloc-\u003einfo);\n\tkfree_rcu(alloc, rcu_head);\n\nThe RX fast path reads link_sta under rcu_read_lock and writes the percpu\nstats. A reader that resolved link_sta before the removal keeps the\npointer. The container stays alive from the kfree_rcu, so the read still\nworks. But the percpu block it points to is already freed. This needs\nuses_rss. That is when pcpu_rx_stats exists.\n\nThe full STA teardown frees the deflink stats only after\nsynchronize_net(). The link removal path had no such barrier. The race is\nhard to win in practice, but the free should still wait for RCU.\n\nFree the link together with its data from a single RCU callback, so the\npercpu block is reclaimed only after readers drain.",
  "id": "CVE-2026-68409",
  "modified": "2026-08-12T03:51:46.147903140Z",
  "published": "2026-08-10T12:04:29.238Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2aa1789880fa5e41049b0f6a74a4fc2fa1997610"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a03fceae0c65b31ce31840dac5e26684ceecb65b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa2eb62525188269cdd402a583b9a8ed94657ff0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68409.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68409"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "wifi: mac80211: defer link RX stats percpu free to RCU"
}