{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f4676ea74b8549cd88dbfe2a592ce4530039e61f"
            },
            {
              "fixed": "abf4feaee6405f1441929c6ebe7a250f2cd170a7"
            },
            {
              "fixed": "ab5ebab9664214ba41a7633cb4e72f128204f924"
            },
            {
              "fixed": "9e08ad731862b22a87cc55f752e16d66cdc9e231"
            },
            {
              "fixed": "b2662e7593e94ae09b1cf7ee5f09160a3612bcb2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.9.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.19"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43374.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix percpu use-after-free in remove_nh_grp_entry\n\nWhen removing a nexthop from a group, remove_nh_grp_entry() publishes\nthe new group via rcu_assign_pointer() then immediately frees the\nremoved entry's percpu stats with free_percpu(). However, the\nsynchronize_net() grace period in the caller remove_nexthop_from_groups()\nruns after the free. RCU readers that entered before the publish still\nsee the old group and can dereference the freed stats via\nnh_grp_entry_stats_inc() -\u003e get_cpu_ptr(nhge-\u003estats), causing a\nuse-after-free on percpu memory.\n\nFix by deferring the free_percpu() until after synchronize_net() in the\ncaller. Removed entries are chained via nh_list onto a local deferred\nfree list. After the grace period completes and all RCU readers have\nfinished, the percpu stats are safely freed.",
  "id": "CVE-2026-43374",
  "modified": "2026-07-15T01:49:04.453343543Z",
  "published": "2026-05-08T14:21:24.537Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abf4feaee6405f1441929c6ebe7a250f2cd170a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43374.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43374"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: nexthop: fix percpu use-after-free in remove_nh_grp_entry"
}