{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4832c30d5458387ff2533ff66fbde26ad8bb5a2d"
            },
            {
              "fixed": "4a48fe59f29f673a3d042d679f26629a9c3e29d4"
            },
            {
              "fixed": "581800298313c9fd75e94985e6d37d21b7e35d34"
            },
            {
              "fixed": "3310fc11fc47387d1dd4759b0bc961643ea11c7f"
            },
            {
              "fixed": "0b5a7826020706057cc5a9d9009e667027f221ee"
            },
            {
              "fixed": "ae88c8256547b63980770a9ea7be73a15900d27e"
            },
            {
              "fixed": "2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.14.0"
            },
            {
              "fixed": "6.1.167"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.77"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.17"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23304.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()\n\nl3mdev_master_dev_rcu() can return NULL when the slave device is being\nun-slaved from a VRF. All other callers deal with this, but we lost\nthe fallback to loopback in ip6_rt_pcpu_alloc() -\u003e ip6_rt_get_dev_rcu()\nwith commit 4832c30d5458 (\"net: ipv6: put host and anycast routes on\ndevice with address\").\n\n  KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n  RIP: 0010:ip6_rt_pcpu_alloc (net/ipv6/route.c:1418)\n  Call Trace:\n   ip6_pol_route (net/ipv6/route.c:2318)\n   fib6_rule_lookup (net/ipv6/fib6_rules.c:115)\n   ip6_route_output_flags (net/ipv6/route.c:2607)\n   vrf_process_v6_outbound (drivers/net/vrf.c:437)\n\nI was tempted to rework the un-slaving code to clear the flag first\nand insert synchronize_rcu() before we remove the upper. But looks like\nthe explicit fallback to loopback_dev is an established pattern.\nAnd I guess avoiding the synchronize_rcu() is nice, too.",
  "id": "CVE-2026-23304",
  "modified": "2026-04-01T23:09:31.236137777Z",
  "published": "2026-03-25T10:26:59.015Z",
  "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/0b5a7826020706057cc5a9d9009e667027f221ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23304.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23304"
    }
  ],
  "schema_version": "1.7.3",
  "summary": "ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()"
}