CVE-2026-90086 (GCVE-0-2026-90086)
Vulnerability from cvelistv5
Published
2026-09-17 16:06
Modified
2026-10-21 12:49
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 48eb03dd26304c24f03bdbb9382e89c8564e71df
Version: 48eb03dd26304c24f03bdbb9382e89c8564e71df
Version: 48eb03dd26304c24f03bdbb9382e89c8564e71df
Version: 48eb03dd26304c24f03bdbb9382e89c8564e71df
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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",
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        },
        {
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          "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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              "version": "6.8"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
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                },
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                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-10-21T12:49:45.759Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8ba0d143e471c85f8a116707c0b42bf046b0a7b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/53a5b262d706b572840cbe8feae392538077ee19"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf9387488d6394845076928c6ca5315ce5d84f54"
        },
        {
          "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": "2026-10-21T12:49:45.759Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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