CVE-2026-90086 (GCVE-0-2026-90086)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-09-17 16:06
VLAI
Title
xsk: honor XDP_TX_METADATA in zero-copy path
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: honor XDP_TX_METADATA in zero-copy path The zero-copy path reads TX metadata whenever the UMEM has metadata space, even if the descriptor does not set XDP_TX_METADATA. Pass descriptor options through the metadata helpers and ignore metadata unless the option is set. This does not fix the existing per-WQE metadata handling for mlx5 MPWQEs. Only the descriptor that starts a session passes through xsk_tx_metadata_request() and configures offload state shared by the batch. Metadata on descriptors joining an open session is therefore not validated and does not configure its requested offloads. In addition, a non-NULL metadata pointer from such a descriptor is treated as a timestamp completion request even when XDP_TXMD_FLAGS_TIMESTAMP is not set, so its metadata union can be overwritten with an unrequested timestamp. Fixing mixed metadata states within one MPWQE requires a separate change.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 48eb03dd26304c24f03bdbb9382e89c8564e71df , < 53a5b262d706b572840cbe8feae392538077ee19 (git)
Affected: 48eb03dd26304c24f03bdbb9382e89c8564e71df , < bf9387488d6394845076928c6ca5315ce5d84f54 (git)
Affected: 48eb03dd26304c24f03bdbb9382e89c8564e71df , < a6e4b9a6deb9362ef7a0706c70d674e92fe1411a (git)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_main.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
            "include/net/libeth/xsk.h",
            "include/net/xdp_sock_drv.h",
            "include/net/xsk_buff_pool.h",
            "net/xdp/xsk_buff_pool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_main.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
            "include/net/libeth/xsk.h",
            "include/net/xdp_sock_drv.h",
            "include/net/xsk_buff_pool.h",
            "net/xdp/xsk_buff_pool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: honor XDP_TX_METADATA in zero-copy path\n\nThe zero-copy path reads TX metadata whenever the UMEM has metadata space,\neven if the descriptor does not set XDP_TX_METADATA. Pass descriptor\noptions through the metadata helpers and ignore metadata unless the option\nis set.\n\nThis does not fix the existing per-WQE metadata handling for mlx5 MPWQEs.\nOnly the descriptor that starts a session passes through\nxsk_tx_metadata_request() and configures offload state shared by the batch.\nMetadata on descriptors joining an open session is therefore not validated\nand does not configure its requested offloads. In addition, a non-NULL\nmetadata pointer from such a descriptor is treated as a timestamp\ncompletion request even when XDP_TXMD_FLAGS_TIMESTAMP is not set, so its\nmetadata union can be overwritten with an unrequested timestamp. Fixing\nmixed metadata states within one MPWQE requires a separate change."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:06:02.212Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/a6e4b9a6deb9362ef7a0706c70d674e92fe1411a"
        }
      ],
      "title": "xsk: honor XDP_TX_METADATA in zero-copy path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90086",
    "datePublished": "2026-09-17T16:06:02.212Z",
    "dateReserved": "2026-09-11T19:38:34.785Z",
    "dateUpdated": "2026-09-17T16:06:02.212Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-90086",
      "date": "2026-09-25",
      "epss": "0.00206",
      "percentile": "0.09519"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/intel/igc/igc_main.c",
                  "drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c",
                  "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
                  "include/net/libeth/xsk.h",
                  "include/net/xdp_sock_drv.h",
                  "include/net/xsk_buff_pool.h",
                  "net/xdp/xsk_buff_pool.c"
                ],
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                  "drivers/net/ethernet/intel/igc/igc_main.c",
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                  "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
                  "include/net/libeth/xsk.h",
                  "include/net/xdp_sock_drv.h",
                  "include/net/xsk_buff_pool.h",
                  "net/xdp/xsk_buff_pool.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "version": "7.2.6",
                    "versionType": "semver"
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: honor XDP_TX_METADATA in zero-copy path\n\nThe zero-copy path reads TX metadata whenever the UMEM has metadata space,\neven if the descriptor does not set XDP_TX_METADATA. Pass descriptor\noptions through the metadata helpers and ignore metadata unless the option\nis set.\n\nThis does not fix the existing per-WQE metadata handling for mlx5 MPWQEs.\nOnly the descriptor that starts a session passes through\nxsk_tx_metadata_request() and configures offload state shared by the batch.\nMetadata on descriptors joining an open session is therefore not validated\nand does not configure its requested offloads. In addition, a non-NULL\nmetadata pointer from such a descriptor is treated as a timestamp\ncompletion request even when XDP_TXMD_FLAGS_TIMESTAMP is not set, so its\nmetadata union can be overwritten with an unrequested timestamp. Fixing\nmixed metadata states within one MPWQE requires a separate change."
          }
        ],
        "id": "CVE-2026-90086",
        "lastModified": "2026-09-17T17:16:58.637",
        "metrics": {},
        "published": "2026-09-17T17:16:58.637",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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