{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-39810",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T18:14:51.954727Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T18:22:55.131Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/bnxt/bnxt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d00e98977ef519280b075d783653e2c492fffbb6",
              "status": "affected",
              "version": "ec5d31e3c15d5233b491400133c67f78a320062c",
              "versionType": "git"
            },
            {
              "lessThan": "9ab6a9950f152e094395d2e3967f889857daa185",
              "status": "affected",
              "version": "ec5d31e3c15d5233b491400133c67f78a320062c",
              "versionType": "git"
            },
            {
              "lessThan": "2747328ba2714f1a7454208dbbc1dc0631990b4a",
              "status": "affected",
              "version": "ec5d31e3c15d5233b491400133c67f78a320062c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/bnxt/bnxt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.45",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.5",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: Fix memory corruption when FW resources change during ifdown\n\nbnxt_set_dflt_rings() assumes that it is always called before any TC has\nbeen created.  So it doesn\u0027t take bp-\u003enum_tc into account and assumes\nthat it is always 0 or 1.\n\nIn the FW resource or capability change scenario, the FW will return\nflags in bnxt_hwrm_if_change() that will cause the driver to\nreinitialize and call bnxt_cancel_reservations().  This will lead to\nbnxt_init_dflt_ring_mode() calling bnxt_set_dflt_rings() and bp-\u003enum_tc\nmay be greater than 1.  This will cause bp-\u003etx_ring[] to be sized too\nsmall and cause memory corruption in bnxt_alloc_cp_rings().\n\nFix it by properly scaling the TX rings by bp-\u003enum_tc in the code\npaths mentioned above.  Add 2 helper functions to determine\nbp-\u003etx_nr_rings and bp-\u003etx_nr_rings_per_tc."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The trigger sequence is local device configuration \u2014 mqprio/DCBNL to set `bp-\u003enum_tc \u003e 1` via rtnetlink, then a link down/up cycle through `bnxt_open()`. No remote peer traffic or network protocol data reaches the vulnerable computation.\nAC:L - The attacker arms the condition persistently: once multi-TC is configured, every subsequent ifup that sees a firmware `RESC_CHANGE`/`CAPS_CHANGE` deterministically undersizes `bp-\u003etx_ring[]`, and such resource changes are routine recurring events (SR-IOV VF count changes, RoCE driver load/unload, firmware update, PF reconfiguration) that can simply be waited out and re-triggered by cycling the interface \u2014 there is no one-shot race to win.\nPR:L - Reaching the path needs CAP_NET_ADMIN over the bnxt netdev, which in the common SR-IOV cloud/Kubernetes deployment is held by an otherwise unprivileged container after a VF is delegated into its user-namespace-owned network namespace, where `tc qdisc add ... mqprio` and `ip link set up` are permitted. That is delegated network-admin capability, not real root in the init namespace.\nUI:N - No victim action is needed \u2014 the corruption occurs entirely within the attacker\u0027s own interface bring-up sequence once the multi-TC configuration is in place.\nS:U - The out-of-bounds write corrupts kernel heap objects belonging to the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The overflow plants live `bnxt_cp_ring_info` pointers into adjacent heap objects and leaves `netdev_set_tc_queue()` mappings pointing past `real_num_tx_queues`, so subsequent TX-completion and queue-selection code dereferences and reads memory outside the intended objects, which is leverageable for kernel memory disclosure.\nI:H - `bp-\u003etx_ring[n].tx_cpr = cpr2` writes a kernel heap pointer well beyond the `kcalloc`\u0027d array, at an offset scaled by the attacker-chosen `num_tc` and per-TC ring count \u2014 a placement-influenceable arbitrary-ish pointer write into neighbouring slab objects, the classic primitive for control-flow hijack.\nA:H - Corrupting unrelated heap allocations with stray pointers, plus TX queues indexed past `real_num_tx_queues`, reliably produces oops/panic on a machine performing normal networking, and the sequence can be repeated at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:05:21.587Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d00e98977ef519280b075d783653e2c492fffbb6"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ab6a9950f152e094395d2e3967f889857daa185"
        },
        {
          "url": "https://git.kernel.org/stable/c/2747328ba2714f1a7454208dbbc1dc0631990b4a"
        }
      ],
      "title": "bnxt_en: Fix memory corruption when FW resources change during ifdown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39810",
    "datePublished": "2025-09-16T13:00:12.677Z",
    "dateReserved": "2025-04-16T07:20:57.137Z",
    "dateUpdated": "2026-08-05T12:05:21.587Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}