CVE-2026-64102 (GCVE-0-2026-64102)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
RDMA/siw: Reject MPA FPDU length underflow before signed receive math
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Reject MPA FPDU length underflow before signed receive math A malicious connected siw peer can send an iWARP FPDU whose MPA length field (c_hdr->mpa_len, 16 bit big-endian, peer-controlled) is smaller than the fixed DDP/RDMAP header for the announced opcode. Soft-iWARP parses the full header in siw_get_hdr() based on iwarp_pktinfo[opcode] .hdr_len, but never compares mpa_len against that header length. siw_tcp_rx_data() then derives srx->fpdu_part_rem = be16_to_cpu(mpa_len) - fpdu_part_rcvd + MPA_HDR_SIZE; where fpdu_part_rcvd equals iwarp_pktinfo[opcode].hdr_len at this point. For a tagged WRITE (hdr_len 16, MPA_HDR_SIZE 2) the smallest on-wire mpa_len of 0 yields fpdu_part_rem = -14, and any mpa_len below hdr_len - MPA_HDR_SIZE underflows to a negative int. The signed value then flows into siw_proc_write()/siw_proc_rresp() as bytes = min(srx->fpdu_part_rem, srx->skb_new); is handed to siw_check_mem() as an int len (whose interval check addr + len > mem->va + mem->len is satisfied for a valid base when len is negative), and reaches siw_rx_data() -> siw_rx_kva() / siw_rx_umem() -> skb_copy_bits() as a signed copy length. The header copy branch in skb_copy_bits() promotes that to size_t, producing a multi-gigabyte read. KASAN under a KUnit harness that drives the real kernel TCP receive path -- a loopback AF_INET socketpair, the malformed FPDU written via kernel_sendmsg, sk_data_ready firing in softirq, tcp_read_sock dispatching to siw_tcp_rx_data -- reports: BUG: KASAN: use-after-free in skb_copy_bits+0x284/0x480 Read of size 4294967295 at addr ffff888... Call Trace: skb_copy_bits siw_rx_kva siw_rx_data siw_check_mem siw_proc_write siw_tcp_rx_data __tcp_read_sock siw_qp_llp_data_ready tcp_data_ready tcp_data_queue Add the missing invariant at the earliest point where the peer header is fully assembled. iwarp_pktinfo[*].hdr_len - MPA_HDR_SIZE is exactly the value the siw transmitter uses as the minimum mpa_len for each opcode (drivers/infiniband/sw/siw/siw_qp.c:33), so this matches the protocol contract. Out-of-range FPDUs terminate the connection with TERM_ERROR_LAYER_LLP / LLP_ETYPE_MPA / LLP_ECODE_FPDU_START -- which is RFC 5044 Section 8 error code 3 ("Marker and ULPDU Length fields do not agree on the start of an FPDU"), the correct framing-error class for this inconsistency.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 683f7cfbf514193d63c0efa079f3352bde84c2e0 (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 4a331582011d9e8089af8aa2a61ec6b4443bb245 (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 33a8b5e971e294ec2a7b74211c545e09efd8e9ac (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 14553be882d9ce91749c9d64041de66e34ad8e70 (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < c7c0c0f4379dedec12d24dbb9dded5d2db7fd9f2 (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 1012896f4225e8f801ff3c1648023845b66dfb11 (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 775b4dc9618a99a1fa48b57554041a5dc17e1336 (git)
Affected: 8b6a361b8c482f22ac99c3273285ff16b23fba91 , < 0ce1bc9e46ecabe84772bb561e373c0d9876d6f2 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Reject MPA FPDU length underflow before signed receive math\n\nA malicious connected siw peer can send an iWARP FPDU whose MPA length\nfield (c_hdr-\u003empa_len, 16 bit big-endian, peer-controlled) is smaller\nthan the fixed DDP/RDMAP header for the announced opcode. Soft-iWARP\nparses the full header in siw_get_hdr() based on iwarp_pktinfo[opcode]\n.hdr_len, but never compares mpa_len against that header length.\n\nsiw_tcp_rx_data() then derives\n\n    srx-\u003efpdu_part_rem = be16_to_cpu(mpa_len) - fpdu_part_rcvd\n                         + MPA_HDR_SIZE;\n\nwhere fpdu_part_rcvd equals iwarp_pktinfo[opcode].hdr_len at this\npoint. For a tagged WRITE (hdr_len 16, MPA_HDR_SIZE 2) the smallest\non-wire mpa_len of 0 yields fpdu_part_rem = -14, and any mpa_len below\nhdr_len - MPA_HDR_SIZE underflows to a negative int.\n\nThe signed value then flows into siw_proc_write()/siw_proc_rresp() as\n\n    bytes = min(srx-\u003efpdu_part_rem, srx-\u003eskb_new);\n\nis handed to siw_check_mem() as an int len (whose interval check\naddr + len \u003e mem-\u003eva + mem-\u003elen is satisfied for a valid base when\nlen is negative), and reaches siw_rx_data() -\u003e siw_rx_kva() /\nsiw_rx_umem() -\u003e skb_copy_bits() as a signed copy length. The header\ncopy branch in skb_copy_bits() promotes that to size_t, producing a\nmulti-gigabyte read.\n\nKASAN under a KUnit harness that drives the real kernel TCP receive\npath -- a loopback AF_INET socketpair, the malformed FPDU written via\nkernel_sendmsg, sk_data_ready firing in softirq, tcp_read_sock\ndispatching to siw_tcp_rx_data -- reports:\n\n    BUG: KASAN: use-after-free in skb_copy_bits+0x284/0x480\n    Read of size 4294967295 at addr ffff888...\n    Call Trace:\n     skb_copy_bits\n     siw_rx_kva\n     siw_rx_data\n     siw_check_mem\n     siw_proc_write\n     siw_tcp_rx_data\n     __tcp_read_sock\n     siw_qp_llp_data_ready\n     tcp_data_ready\n     tcp_data_queue\n\nAdd the missing invariant at the earliest point where the peer header\nis fully assembled. iwarp_pktinfo[*].hdr_len - MPA_HDR_SIZE is exactly\nthe value the siw transmitter uses as the minimum mpa_len for each\nopcode (drivers/infiniband/sw/siw/siw_qp.c:33), so this matches the\nprotocol contract. Out-of-range FPDUs terminate the connection with\nTERM_ERROR_LAYER_LLP / LLP_ETYPE_MPA / LLP_ECODE_FPDU_START -- which\nis RFC 5044 Section 8 error code 3 (\"Marker and ULPDU Length fields\ndo not agree on the start of an FPDU\"), the correct framing-error\nclass for this inconsistency."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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        "dateUpdated": "2026-07-20T13:43:20.335Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/0ce1bc9e46ecabe84772bb561e373c0d9876d6f2"
        }
      ],
      "title": "RDMA/siw: Reject MPA FPDU length underflow before signed receive math",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64102",
    "datePublished": "2026-07-19T15:40:06.776Z",
    "dateReserved": "2026-07-19T07:54:57.033Z",
    "dateUpdated": "2026-07-20T13:43:20.335Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-64102",
      "date": "2026-07-21",
      "epss": "0.00506",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64102\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:51.383\",\"lastModified\":\"2026-07-20T15:17:09.180\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/siw: Reject MPA FPDU length underflow before signed receive math\\n\\nA malicious connected siw peer can send an iWARP FPDU whose MPA length\\nfield (c_hdr-\u003empa_len, 16 bit big-endian, peer-controlled) is smaller\\nthan the fixed DDP/RDMAP header for the announced opcode. Soft-iWARP\\nparses the full header in siw_get_hdr() based on iwarp_pktinfo[opcode]\\n.hdr_len, but never compares mpa_len against that header length.\\n\\nsiw_tcp_rx_data() then derives\\n\\n    srx-\u003efpdu_part_rem = be16_to_cpu(mpa_len) - fpdu_part_rcvd\\n                         + MPA_HDR_SIZE;\\n\\nwhere fpdu_part_rcvd equals iwarp_pktinfo[opcode].hdr_len at this\\npoint. For a tagged WRITE (hdr_len 16, MPA_HDR_SIZE 2) the smallest\\non-wire mpa_len of 0 yields fpdu_part_rem = -14, and any mpa_len below\\nhdr_len - MPA_HDR_SIZE underflows to a negative int.\\n\\nThe signed value then flows into siw_proc_write()/siw_proc_rresp() as\\n\\n    bytes = min(srx-\u003efpdu_part_rem, srx-\u003eskb_new);\\n\\nis handed to siw_check_mem() as an int len (whose interval check\\naddr + len \u003e mem-\u003eva + mem-\u003elen is satisfied for a valid base when\\nlen is negative), and reaches siw_rx_data() -\u003e siw_rx_kva() /\\nsiw_rx_umem() -\u003e skb_copy_bits() as a signed copy length. The header\\ncopy branch in skb_copy_bits() promotes that to size_t, producing a\\nmulti-gigabyte read.\\n\\nKASAN under a KUnit harness that drives the real kernel TCP receive\\npath -- a loopback AF_INET socketpair, the malformed FPDU written via\\nkernel_sendmsg, sk_data_ready firing in softirq, tcp_read_sock\\ndispatching to siw_tcp_rx_data -- reports:\\n\\n    BUG: KASAN: use-after-free in skb_copy_bits+0x284/0x480\\n    Read of size 4294967295 at addr ffff888...\\n    Call Trace:\\n     skb_copy_bits\\n     siw_rx_kva\\n     siw_rx_data\\n     siw_check_mem\\n     siw_proc_write\\n     siw_tcp_rx_data\\n     __tcp_read_sock\\n     siw_qp_llp_data_ready\\n     tcp_data_ready\\n     tcp_data_queue\\n\\nAdd the missing invariant at the earliest point where the peer header\\nis fully assembled. iwarp_pktinfo[*].hdr_len - MPA_HDR_SIZE is exactly\\nthe value the siw transmitter uses as the minimum mpa_len for each\\nopcode (drivers/infiniband/sw/siw/siw_qp.c:33), so this matches the\\nprotocol contract. Out-of-range FPDUs terminate the connection with\\nTERM_ERROR_LAYER_LLP / LLP_ETYPE_MPA / LLP_ECODE_FPDU_START -- which\\nis RFC 5044 Section 8 error code 3 (\\\"Marker and ULPDU Length fields\\ndo not agree on the start of an FPDU\\\"), the correct framing-error\\nclass for this inconsistency.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/infiniband/sw/siw/siw_qp_rx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"683f7cfbf514193d63c0efa079f3352bde84c2e0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"4a331582011d9e8089af8aa2a61ec6b4443bb245\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"33a8b5e971e294ec2a7b74211c545e09efd8e9ac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"14553be882d9ce91749c9d64041de66e34ad8e70\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"c7c0c0f4379dedec12d24dbb9dded5d2db7fd9f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"1012896f4225e8f801ff3c1648023845b66dfb11\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"775b4dc9618a99a1fa48b57554041a5dc17e1336\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\"lessThan\":\"0ce1bc9e46ecabe84772bb561e373c0d9876d6f2\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/infiniband/sw/siw/siw_qp_rx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ce1bc9e46ecabe84772bb561e373c0d9876d6f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1012896f4225e8f801ff3c1648023845b66dfb11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/14553be882d9ce91749c9d64041de66e34ad8e70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33a8b5e971e294ec2a7b74211c545e09efd8e9ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a331582011d9e8089af8aa2a61ec6b4443bb245\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/683f7cfbf514193d63c0efa079f3352bde84c2e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/775b4dc9618a99a1fa48b57554041a5dc17e1336\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7c0c0f4379dedec12d24dbb9dded5d2db7fd9f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T04:29:53+00:00",
      "cve": "CVE-2026-64102",
      "id": "CVE-2026-64102",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "119",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/siw: Reject MPA FPDU length underflow before signed receive math",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64102.json",
      "version": "3"
    }
  }
}



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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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.