{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-47399",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47399",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T15:03:54.714Z",
    "updatedAt": "2026-05-11T13:53:56.325Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ixgbe: Fix NULL pointer dereference in ixgbe_xdp_setup",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nixgbe: Fix NULL pointer dereference in ixgbe_xdp_setup\n\nThe ixgbe driver currently generates a NULL pointer dereference with\nsome machine (online cpus < 63). This is due to the fact that the\nmaximum value of num_xdp_queues is nr_cpu_ids. Code is in\n\"ixgbe_set_rss_queues\"\".\n\nHere's how the problem repeats itself:\nSome machine (online cpus < 63), And user set num_queues to 63 through\nethtool. Code is in the \"ixgbe_set_channels\",\n\tadapter->ring_feature[RING_F_FDIR].limit = count;\n\nIt becomes 63.\n\nWhen user use xdp, \"ixgbe_set_rss_queues\" will set queues num.\n\tadapter->num_rx_queues = rss_i;\n\tadapter->num_tx_queues = rss_i;\n\tadapter->num_xdp_queues = ixgbe_xdp_queues(adapter);\n\nAnd rss_i's value is from\n\tf = &adapter->ring_feature[RING_F_FDIR];\n\trss_i = f->indices = f->limit;\n\nSo \"num_rx_queues\" > \"num_xdp_queues\", when run to \"ixgbe_xdp_setup\",\n\tfor (i = 0; i < adapter->num_rx_queues; i++)\n\t\tif (adapter->xdp_ring[i]->xsk_umem)\n\nIt leads to panic.\n\nCall trace:\n[exception RIP: ixgbe_xdp+368]\nRIP: ffffffffc02a76a0  RSP: ffff9fe16202f8d0  RFLAGS: 00010297\nRAX: 0000000000000000  RBX: 0000000000000020  RCX: 0000000000000000\nRDX: 0000000000000000  RSI: 000000000000001c  RDI: ffffffffa94ead90\nRBP: ffff92f8f24c0c18   R8: 0000000000000000   R9: 0000000000000000\nR10: ffff9fe16202f830  R11: 0000000000000000  R12: ffff92f8f24c0000\nR13: ffff9fe16202fc01  R14: 000000000000000a  R15: ffffffffc02a7530\nORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018\n 7 [ffff9fe16202f8f0] dev_xdp_install at ffffffffa89fbbcc\n 8 [ffff9fe16202f920] dev_change_xdp_fd at ffffffffa8a08808\n 9 [ffff9fe16202f960] do_setlink at ffffffffa8a20235\n10 [ffff9fe16202fa88] rtnl_setlink at ffffffffa8a20384\n11 [ffff9fe16202fc78] rtnetlink_rcv_msg at ffffffffa8a1a8dd\n12 [ffff9fe16202fcf0] netlink_rcv_skb at ffffffffa8a717eb\n13 [ffff9fe16202fd40] netlink_unicast at ffffffffa8a70f88\n14 [ffff9fe16202fd80] netlink_sendmsg at ffffffffa8a71319\n15 [ffff9fe16202fdf0] sock_sendmsg at ffffffffa89df290\n16 [ffff9fe16202fe08] __sys_sendto at ffffffffa89e19c8\n17 [ffff9fe16202ff30] __x64_sys_sendto at ffffffffa89e1a64\n18 [ffff9fe16202ff38] do_syscall_64 at ffffffffa84042b9\n19 [ffff9fe16202ff50] entry_SYSCALL_64_after_hwframe at ffffffffa8c0008c\n\nSo I fix ixgbe_max_channels so that it will not allow a setting of queues\nto be higher than the num_online_cpus(). And when run to ixgbe_xdp_setup,\ntake the smaller value of num_rx_queues and num_xdp_queues.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4a9b32f30f805ca596d76605903a48eab58e0b88",
              "status": "affected",
              "versionType": "git",
              "lessThan": "20f6c4a31a525edd9ea6243712b868ba0e4e331e"
            },
            {
              "version": "4a9b32f30f805ca596d76605903a48eab58e0b88",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2744341dd52e935344ca1b4bf189ba0d182a3e8e"
            },
            {
              "version": "4a9b32f30f805ca596d76605903a48eab58e0b88",
              "status": "affected",
              "versionType": "git",
              "lessThan": "513e605d7a9ce136886cb42ebb2c40e9a6eb6333"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.0"
            },
            {
              "version": "5.10.71",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.14.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.14.*"
            },
            {
              "version": "5.15",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}