{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "98aa546af5e4f180439c82da403cc77926d3953b"
            },
            {
              "fixed": "5045aa25f3790dcdb158a58ac60ccf8da42959aa"
            },
            {
              "fixed": "ed902d5546fb9c142b3216d8eec914fa1bc0aa80"
            },
            {
              "fixed": "f9722746df13a8a29103c847ef56b02c11ce0963"
            },
            {
              "fixed": "be31fe6333f534155e6b408f1ef6d77974bb41aa"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98596.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix dst leak for uncached routes.\n\nip6_route_output_flags(), ip6_rt_put_flags(), and ip6_dst_check()\ndetect an uncached route by list_empty(\u0026rt-\u003edst.rt_uncached),\nwhich replaced the static DST_NOCACHE flag check in commit\na4c2fd7f7891 (\"net: remove DST_NOCACHE flag\").\n\nWhen a device is unregistered, rt6_uncached_list_flush_dev()\nunlinks uncached routes tied to the device from rt6_uncached_list.\n\nPreviously, they were moved to another list with list_move()\n(__list_del_entry() + list_add()), and since commit 98aa546af5e4\n(\"inet: remove (struct uncached_list)-\u003equarantine\"), the routes\nare just unlinked with list_del_init().\n\nIf list_del_init() runs concurrently, list_empty() evaluates to\ntrue; ip6_route_output_flags() calls dst_hold_safe() incorrectly\nand ip6_rt_put_flags() skips ip6_rt_put(), leaking dst, and thus\ndev tied via rt-\u003efrom as well.\n\nThe same race is partially fixed by commit 9a6f0c4d5796 (\"dst:\nfix races in rt6_uncached_list_del() and rt_del_uncached_list()\").\n\nLet's check rt6-\u003edst.rt_uncached_list instead.\n\nNote that IPv4 does not have the same issue.",
  "id": "CVE-2026-98596",
  "modified": "2026-10-20T02:30:16.689719609Z",
  "published": "2026-10-18T15:19:09.189Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5045aa25f3790dcdb158a58ac60ccf8da42959aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be31fe6333f534155e6b408f1ef6d77974bb41aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed902d5546fb9c142b3216d8eec914fa1bc0aa80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9722746df13a8a29103c847ef56b02c11ce0963"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98596.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98596"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ipv6: Fix dst leak for uncached routes."
}