CVE-2026-22998 (GCVE-0-2026-22998)
Vulnerability from cvelistv5
Published
2026-01-25 14:36
Modified
2026-08-05 12:20
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec Commit efa56305908b ("nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length") added ttag bounds checking and data_offset validation in nvmet_tcp_handle_h2c_data_pdu(), but it did not validate whether the command's data structures (cmd->req.sg and cmd->iov) have been properly initialized before processing H2C_DATA PDUs. The nvmet_tcp_build_pdu_iovec() function dereferences these pointers without NULL checks. This can be triggered by sending H2C_DATA PDU immediately after the ICREQ/ICRESP handshake, before sending a CONNECT command or NVMe write command. Attack vectors that trigger NULL pointer dereferences: 1. H2C_DATA PDU sent before CONNECT → both pointers NULL 2. H2C_DATA PDU for READ command → cmd->req.sg allocated, cmd->iov NULL 3. H2C_DATA PDU for uninitialized command slot → both pointers NULL The fix validates both cmd->req.sg and cmd->iov before calling nvmet_tcp_build_pdu_iovec(). Both checks are required because: - Uninitialized commands: both NULL - READ commands: cmd->req.sg allocated, cmd->iov NULL - WRITE commands: both allocated
References
Impacted products
Vendor Product Version
Linux Linux Version: f775f2621c2ac5cc3a0b3a64665dad4fb146e510
Version: 4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d
Version: 2871aa407007f6f531fae181ad252486e022df42
Version: 24e05760186dc070d3db190ca61efdbce23afc88
Version: efa56305908ba20de2104f1b8508c6a7401833be
Version: efa56305908ba20de2104f1b8508c6a7401833be
Version: efa56305908ba20de2104f1b8508c6a7401833be
Version: ee5e7632e981673f42a50ade25e71e612e543d9d
Version: 70154e8d015c9b4fb56c1a2ef1fc8b83d45c7f68
Version: 5.10.209   ≤
Version: 5.15.148   ≤
Version: 6.1.75   ≤
Version: 6.6.14   ≤
Version: 5.4.268   ≤
Version: 6.7.2   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec\n\nCommit efa56305908b (\"nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length\")\nadded ttag bounds checking and data_offset\nvalidation in nvmet_tcp_handle_h2c_data_pdu(), but it did not validate\nwhether the command\u0027s data structures (cmd-\u003ereq.sg and cmd-\u003eiov) have\nbeen properly initialized before processing H2C_DATA PDUs.\n\nThe nvmet_tcp_build_pdu_iovec() function dereferences these pointers\nwithout NULL checks. This can be triggered by sending H2C_DATA PDU\nimmediately after the ICREQ/ICRESP handshake, before\nsending a CONNECT command or NVMe write command.\n\nAttack vectors that trigger NULL pointer dereferences:\n1. H2C_DATA PDU sent before CONNECT \u2192 both pointers NULL\n2. H2C_DATA PDU for READ command \u2192 cmd-\u003ereq.sg allocated, cmd-\u003eiov NULL\n3. H2C_DATA PDU for uninitialized command slot \u2192 both pointers NULL\n\nThe fix validates both cmd-\u003ereq.sg and cmd-\u003eiov before calling\nnvmet_tcp_build_pdu_iovec(). Both checks are required because:\n- Uninitialized commands: both NULL\n- READ commands: cmd-\u003ereq.sg allocated, cmd-\u003eiov NULL\n- WRITE commands: both allocated"
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              "value": "AV:N - The vulnerable code is in the NVMe over TCP target receive path and is reachable by sending NVMe/TCP PDUs to the target TCP listener. A remote peer can send ICREQ followed by malformed H2C_DATA over the network.\nAC:L - No race or hard-to-control state is required for the pre-CONNECT trigger; the attacker only needs to send a valid IC handshake and then an H2C_DATA PDU with coherent length fields. The required packet sequence is deterministic.\nPR:N - The simplest trigger occurs after ICREQ/ICRESP but before CONNECT, before host NQN allow-list checks, controller creation, or DH-HMAC-CHAP authentication are reached. Thus an unauthenticated network peer can reach the vulnerable handler on a non-TLS or plaintext-accepted target port.\nUI:N - Exploitation does not require any victim user action after the target service is listening. The attacker sends protocol messages directly to the NVMe/TCP target.\nS:U - The impact is within the vulnerable kernel/target system\u2019s own security authority. There is no VM escape, IOMMU bypass, or cross-authority boundary change.\nC:N - The bug is a NULL pointer dereference of uninitialized command buffers, not an out-of-bounds read or use-after-free. The investigated paths support a crash impact, not disclosure of kernel memory.\nI:N - The dereferences are to NULL command buffer pointers and do not provide a practical arbitrary write or control-flow primitive. The fix and related history characterize the issue as invalid state leading to NULL dereference.\nA:H - The vulnerable dereference occurs in kernel context and can produce an oops or panic in the nvmet-tcp workqueue path. Repeated unauthenticated network triggers can deny availability of the target system or service."
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    "cveId": "CVE-2026-22998",
    "datePublished": "2026-01-25T14:36:12.935Z",
    "dateReserved": "2026-01-13T15:37:45.938Z",
    "dateUpdated": "2026-08-05T12:20:02.379Z",
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\"https://git.kernel.org/stable/c/32b63acd78f577b332d976aa06b56e70d054cbba\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec\\n\\nCommit efa56305908b (\\\"nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length\\\")\\nadded ttag bounds checking and data_offset\\nvalidation in nvmet_tcp_handle_h2c_data_pdu(), but it did not validate\\nwhether the command\u0027s data structures (cmd-\u003ereq.sg and cmd-\u003eiov) have\\nbeen properly initialized before processing H2C_DATA PDUs.\\n\\nThe nvmet_tcp_build_pdu_iovec() function dereferences these pointers\\nwithout NULL checks. This can be triggered by sending H2C_DATA PDU\\nimmediately after the ICREQ/ICRESP handshake, before\\nsending a CONNECT command or NVMe write command.\\n\\nAttack vectors that trigger NULL pointer dereferences:\\n1. H2C_DATA PDU sent before CONNECT \\u2192 both pointers NULL\\n2. H2C_DATA PDU for READ command \\u2192 cmd-\u003ereq.sg allocated, cmd-\u003eiov NULL\\n3. H2C_DATA PDU for uninitialized command slot \\u2192 both pointers NULL\\n\\nThe fix validates both cmd-\u003ereq.sg and cmd-\u003eiov before calling\\nnvmet_tcp_build_pdu_iovec(). Both checks are required because:\\n- Uninitialized commands: both NULL\\n- READ commands: cmd-\u003ereq.sg allocated, cmd-\u003eiov NULL\\n- WRITE commands: both allocated\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.249\", \"versionStartIncluding\": \"5.10.209\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"5.15.148\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"6.1.75\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.122\", \"versionStartIncluding\": \"6.6.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.67\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.7\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.268\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.7.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T16:03:38.884Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-22998\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T20:38:12.309Z\", \"dateReserved\": \"2026-01-13T15:37:45.938Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-25T14:36:12.935Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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