CVE-2026-98323 (GCVE-0-2026-98323)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:17
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Bound fragmented header copies by the remaining length siw_get_hdr() can receive an extended DDP/RDMAP header across more than one TCP callback. The first callback may receive most of the header, while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead of the number of missing bytes. This makes the destination move past the end of the header and overwrite the receive state, including fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd value as a copy offset, which creates an OOB write. Use the number of header bytes already received when calculating the next copy length.
References
Impacted products
Vendor Product Version
Linux Linux Version: e3917c85f41ef1df64e27dc0e46ab0d803c5e73e
Version: 308cd50f174c95a507527037f4de1a0396aa4325
Version: 754209850df8367c954ac1de7671c7430b1f342c
Version: 754209850df8367c954ac1de7671c7430b1f342c
Version: 754209850df8367c954ac1de7671c7430b1f342c
Version: 754209850df8367c954ac1de7671c7430b1f342c
Version: 754209850df8367c954ac1de7671c7430b1f342c
Version: 754209850df8367c954ac1de7671c7430b1f342c
Version: e09caa38e10bcf027100cc22b0e3cc745a39ef0a
Version: 0c14f795a9eab9344230f9933798b8ee496f497d
Version: 7fada7c6962219b6fc4ff4e62e46a936af110dd9
Version: 5.10.150   ≤
Version: 5.15.75   ≤
Version: 5.4.220   ≤
Version: 5.19.17   ≤
Version: 6.0.3   ≤
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{
  "containers": {
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          "programFiles": [
            "drivers/infiniband/sw/siw/siw_qp_rx.c"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "7.2.8",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "vulnerable": true
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Bound fragmented header copies by the remaining length\n\nsiw_get_hdr() can receive an extended DDP/RDMAP header across more than\none TCP callback. The first callback may receive most of the header,\nwhile the next one still limits the copy to hdrlen - MIN_DDP_HDR instead\nof the number of missing bytes. This makes the destination move past the\nend of the header and overwrite the receive state, including\nfpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd\nvalue as a copy offset, which creates an OOB write.\n\nUse the number of header bytes already received when calculating the\nnext copy length."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The malformed input is the remote iWARP peer\u0027s own MPA/DDP/RDMAP header bytes on the siw TCP connection. The peer splits an extended header (e.g. RDMA Read Request, 44 bytes) across TCP segments, and siw_qp_llp_data_ready() -\u003e tcp_read_sock() -\u003e siw_tcp_rx_data() -\u003e siw_get_hdr() parses them. The transport is routable TCP.\nAC:L - The peer fully controls TCP segmentation, so it can deterministically end a segment with fpdu_part_rcvd between 16 and hdrlen. The next segment then copies hdrlen-16 bytes at that offset. No race or state outside the attacker\u0027s control is involved beyond siw serving an iWARP listener.\nPR:N - Once the MPA exchange puts the QP in RTS, siw_get_hdr() parses every incoming FPDU header, and neither MPA nor DDP authenticates the peer. ULP authorisation (such as an nvmet-rdma host NQN check) only arrives in messages parsed by this same path, so the overflow fires before any credential check.\nUI:N - No victim action is needed. The attacker connects to the iWARP service and sends crafted fragmented FPDUs, and siw processes them in its sk_data_ready callback.\nS:U - The corruption is confined to kernel memory of the host running siw (struct siw_qp and its neighbours). That is the same security authority as the vulnerable component, with no VM or IOMMU boundary crossed.\nC:H - The overflow writes peer bytes over siw_rx_stream fields after hdr, including fpdu_part_rcvd. A negative fpdu_part_rcvd then makes skb_copy_bits() write to c_hdr plus an attacker-chosen offset. A controlled kernel write like this can be turned into arbitrary kernel memory disclosure.\nI:H - siw_get_hdr() copies up to hdrlen-17 attacker bytes past srx-\u003ehdr (27 for rreq), overwriting the receive state. The next callback uses the corrupted negative fpdu_part_rcvd as the destination offset of skb_copy_bits(), giving an out-of-bounds kernel write whose offset and data are attacker-controlled.\nA:H - Corrupting fpdu_part_rcvd/fpdu_part_rem and writing out of bounds from siw_qp crashes or panics the kernel. A remote peer can repeat this on every connection."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:17:33.779Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48"
        },
        {
          "url": "https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c"
        },
        {
          "url": "https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742"
        },
        {
          "url": "https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411"
        }
      ],
      "title": "RDMA/siw: Bound fragmented header copies by the remaining length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98323",
    "datePublished": "2026-10-06T08:46:17.150Z",
    "dateReserved": "2026-09-25T10:25:14.340Z",
    "dateUpdated": "2026-10-19T09:17:33.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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