ipv6: prevent possible NULL deref in fib6_nh_init()

{
  "id": "6831e5c30bd30908112121cdfcb2cc78ef745f780b6794d2438f650601159793",
  "url": "https://osv.dev/vulnerability/CVE-2024-40961",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ipv6: prevent possible NULL deref in fib6_nh_init()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent possible NULL deref in fib6_nh_init() syzbot reminds us that in6_dev_get() can return NULL. fib6_nh_init() ip6_validate_gw( &idev ) ip6_route_check_nh( idev ) *idev = in6_dev_get(dev); // can be NULL Oops: general protection fault, probably for non-canonical address 0xdffffc00000000bc: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000005e0-0x00000000000005e7] CPU: 0 PID: 11237 Comm: syz-executor.3 Not tainted 6.10.0-rc2-syzkaller-00249-gbe27b8965297 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:fib6_nh_init+0x640/0x2160 net/ipv6/route.c:3606 Code: 00 00 fc ff df 4c 8b 64 24 58 48 8b 44 24 28 4c 8b 74 24 30 48 89 c1 48 89 44 24 28 48 8d 98 e0 05 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 b3 17 00 00 8b 1b 31 ff 89 de e8 b8 8b RSP: 0018:ffffc900032775a0 EFLAGS: 00010202 RAX: 00000000000000bc RBX: 00000000000005e0 RCX: 0000000000000000 RDX: 0000000000000010 RSI: ffffc90003277a54 RDI: ffff88802b3a08d8 RBP: ffffc900032778b0 R08: 00000000000002fc R09: 0000000000000000 R10: 00000000000002fc R11: 0000000000000000 R12: ffff88802b3a08b8 R13: 1ffff9200064eec8 R14: ffffc90003277a00 R15: dffffc0000000000 FS: 00007f940feb06c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000245e8000 CR4: 00000000003506f0 DR0: 000000000000000",
    "evidence": "osv:CVE-2024-40961",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.279",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.162",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.9.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-40961",
      "aliases": [
        "CVE-2024-40961"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "428604fb118facce1309670779a35baf27ad044c"
                },
                {
                  "fixed": "3200ffeec4d59aad5bc9ca75d2c1fae47c0aeade"
                },
                {
                  "fixed": "de5ad4d45cd0128a2a37555f48ab69aa19d78adc"
                },
                {
                  "fixed": "4cdfe813015d5a24586bd0a84fa0fa6eb0a1f668"
                },
                {
                  "fixed": "88b9a55e2e35ea846d41f4efdc29d23345bd1aa4"
                },
                {
                  "fixed": "b6947723c9eabcab58cfb33cdb0a565a6aee6727"
                },
                {
                  "fixed": "ae8d3d39efe366c2198f530e01e4bf07830bf403"
                },
                {
                  "fixed": "2eab4543a2204092c3a7af81d7d6c506e59a03a6"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-40961.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.17.0"
                },
                {
                  "fixed": "5.4.279"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.221"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.162"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.9.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-40961.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.521437818Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-355557.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-613116.html",
        "https://git.kernel.org/stable/c/2eab4543a2204092c3a7af81d7d6c506e59a03a6",
        "https://git.kernel.org/stable/c/3200ffeec4d59aad5bc9ca75d2c1fae47c0aeade",
        "https://git.kernel.org/stable/c/4cdfe813015d5a24586bd0a84fa0fa6eb0a1f668",
        "https://git.kernel.org/stable/c/88b9a55e2e35ea846d41f4efdc29d23345bd1aa4",
        "https://git.kernel.org/stable/c/ae8d3d39efe366c2198f530e01e4bf07830bf403",
        "https://git.kernel.org/stable/c/b6947723c9eabcab58cfb33cdb0a565a6aee6727",
        "https://git.kernel.org/stable/c/de5ad4d45cd0128a2a37555f48ab69aa19d78adc",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/40xxx/CVE-2024-40961.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-40961",
        "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/2024/40xxx/CVE-2024-40961.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-40961",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520135,
  "published_at": "2024-07-12T12:32:02.654+00:00"
}