geneve: make sure to pull inner header in geneve_rx()

{
  "id": "b6c6fe275027f47527ffde518cfa6901d38ab289e57ae8241e1f7053d47c61ce",
  "url": "https://osv.dev/vulnerability/CVE-2024-26857",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "geneve: make sure to pull inner header in geneve_rx()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: geneve: make sure to pull inner header in geneve_rx() syzbot triggered a bug in geneve_rx() [1] Issue is similar to the one I fixed in commit 8d975c15c0cd (\"ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\") We have to save skb->network_header in a temporary variable in order to be able to recompute the network_header pointer after a pskb_inet_may_pull() call. pskb_inet_may_pull() makes sure the needed headers are in skb->head. [1] BUG: KMSAN: uninit-value in IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline] BUG: KMSAN: uninit-value in geneve_rx drivers/net/geneve.c:279 [inline] BUG: KMSAN: uninit-value in geneve_udp_encap_recv+0x36f9/0x3c10 drivers/net/geneve.c:391 IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline] geneve_rx drivers/net/geneve.c:279 [inline] geneve_udp_encap_recv+0x36f9/0x3c10 drivers/net/geneve.c:391 udp_queue_rcv_one_skb+0x1d39/0x1f20 net/ipv4/udp.c:2108 udp_queue_rcv_skb+0x6ae/0x6e0 net/ipv4/udp.c:2186 udp_unicast_rcv_skb+0x184/0x4b0 net/ipv4/udp.c:2346 __udp4_lib_rcv+0x1c6b/0x3010 net/ipv4/udp.c:2422 udp_rcv+0x7d/0xa0 net/ipv4/udp.c:2604 ip_protocol_deliver_rcu+0x264/0x1300 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2b8/0x440 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish net/ipv4/ip_input.c:449 [inline] NF_HOOK include/linux/net",
    "evidence": "osv:CVE-2024-26857",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.310",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.272",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.213",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.152",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.82",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.22",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.7.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-26857",
      "aliases": [
        "CVE-2024-26857"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b"
                },
                {
                  "fixed": "e431c3227864b5646601c97f5f898d99472f2914"
                },
                {
                  "fixed": "59d2a4076983303f324557a114cfd5c32e1f6b29"
                },
                {
                  "fixed": "c7137900691f5692fe3de54566ea7b30bb35d66c"
                },
                {
                  "fixed": "e77e0b0f2a11735c64b105edaee54d6344faca8a"
                },
                {
                  "fixed": "c0b22568a9d8384fd000cc49acb8f74bde40d1b5"
                },
                {
                  "fixed": "0ece581d2a66e8e488c0d3b3e7b5760dbbfdbdd5"
                },
                {
                  "fixed": "048e16dee1fc609c1c85072ccd70bfd4b5fef6ca"
                },
                {
                  "fixed": "1ca1ba465e55b9460e4e75dec9fff31e708fec74"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26857.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.2.0"
                },
                {
                  "fixed": "4.19.310"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.272"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.213"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.152"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.82"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.22"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26857.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.740928451Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/048e16dee1fc609c1c85072ccd70bfd4b5fef6ca",
        "https://git.kernel.org/stable/c/0ece581d2a66e8e488c0d3b3e7b5760dbbfdbdd5",
        "https://git.kernel.org/stable/c/1ca1ba465e55b9460e4e75dec9fff31e708fec74",
        "https://git.kernel.org/stable/c/59d2a4076983303f324557a114cfd5c32e1f6b29",
        "https://git.kernel.org/stable/c/c0b22568a9d8384fd000cc49acb8f74bde40d1b5",
        "https://git.kernel.org/stable/c/c7137900691f5692fe3de54566ea7b30bb35d66c",
        "https://git.kernel.org/stable/c/e431c3227864b5646601c97f5f898d99472f2914",
        "https://git.kernel.org/stable/c/e77e0b0f2a11735c64b105edaee54d6344faca8a",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26857.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26857",
        "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/2024/26xxx/CVE-2024-26857.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-26857",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514501,
  "published_at": "2024-04-17T10:17:19.115+00:00"
}