CVE-2026-22998 (GCVE-0-2026-22998)

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-02-09 08:36
VLAI?
Title
nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f775f2621c2ac5cc3a0b3a64665dad4fb146e510 , < baabe43a0edefac8cd7b981ff87f967f6034dafe (git)
Affected: 4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d , < 76abc83a9d25593c2b7613c549413079c14a4686 (git)
Affected: 2871aa407007f6f531fae181ad252486e022df42 , < 7d75570002929d20e40110d6b03e46202c9d1bc7 (git)
Affected: 24e05760186dc070d3db190ca61efdbce23afc88 , < fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4 (git)
Affected: efa56305908ba20de2104f1b8508c6a7401833be , < 3def5243150716be86599c2a1767c29c68838b6d (git)
Affected: efa56305908ba20de2104f1b8508c6a7401833be , < 374b095e265fa27465f34780e0eb162ff1bef913 (git)
Affected: efa56305908ba20de2104f1b8508c6a7401833be , < 32b63acd78f577b332d976aa06b56e70d054cbba (git)
Affected: ee5e7632e981673f42a50ade25e71e612e543d9d (git)
Affected: 70154e8d015c9b4fb56c1a2ef1fc8b83d45c7f68 (git)
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    Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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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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    "dateUpdated": "2026-02-09T08:36:50.534Z",
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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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnvme-tcp: soluciona desreferencias de puntero NULL en nvmet_tcp_build_pdu_iovec\\n\\nEl commit efa56305908b (\u0027nvmet-tcp: Soluciona un p\u00e1nico del kernel cuando el host env\u00eda una longitud de PDU H2C inv\u00e1lida\u0027) a\u00f1adi\u00f3 la comprobaci\u00f3n de l\u00edmites de ttag y la validaci\u00f3n de data_offset en nvmet_tcp_handle_h2c_data_pdu(), pero no valid\u00f3 si las estructuras de datos del comando (cmd-\u0026gt;req.sg y cmd-\u0026gt;iov) han sido inicializadas correctamente antes de procesar las PDUs H2C_DATA.\\n\\nLa funci\u00f3n nvmet_tcp_build_pdu_iovec() desreferencia estos punteros sin comprobaciones de NULL. Esto puede ser provocado enviando una PDU H2C_DATA inmediatamente despu\u00e9s del handshake ICREQ/ICRESP, antes de enviar un comando CONNECT o un comando de escritura NVMe.\\n\\nVectores de ataque que provocan desreferencias de puntero NULL:\\n1. PDU H2C_DATA enviada antes de CONNECT ? ambos punteros NULL\\n2. PDU H2C_DATA para comando READ ? cmd-\u0026gt;req.sg asignado, cmd-\u0026gt;iov NULL\\n3. PDU H2C_DATA para slot de comando no inicializado ? ambos punteros NULL\\n\\nLa soluci\u00f3n valida tanto cmd-\u0026gt;req.sg como cmd-\u0026gt;iov antes de llamar a nvmet_tcp_build_pdu_iovec(). Ambas comprobaciones son necesarias porque:\\n- Comandos no inicializados: ambos NULL\\n- Comandos READ: cmd-\u0026gt;req.sg asignado, cmd-\u0026gt;iov NULL\\n- Comandos WRITE: ambos asignados\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.268\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"2E4BEAC0-E873-440D-A75E-55699C2412A4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.209\",\"versionEndExcluding\":\"5.10.249\",\"matchCriteriaId\":\"B6983E9C-F8A9-4494-8156-3E2F7E736BF8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.148\",\"versionEndExcluding\":\"5.15.199\",\"matchCriteriaId\":\"B0275B58-DF8C-46AE-B9A5-20396D123D12\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.75\",\"versionEndExcluding\":\"6.1.162\",\"matchCriteriaId\":\"9DE91ACC-6DAF-42AE-8D41-3A91572E9052\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.14\",\"versionEndExcluding\":\"6.6.122\",\"matchCriteriaId\":\"68AE0BF9-0835-45D8-AACC-EDFAC1663259\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7.2\",\"versionEndExcluding\":\"6.12.67\",\"matchCriteriaId\":\"2B14F508-4490-4A35-BEFC-40EF300279E7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.7\",\"matchCriteriaId\":\"99FF3E05-0E7A-44E9-8E47-BF6F1F8EC436\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/32b63acd78f577b332d976aa06b56e70d054cbba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/374b095e265fa27465f34780e0eb162ff1bef913\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3def5243150716be86599c2a1767c29c68838b6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/76abc83a9d25593c2b7613c549413079c14a4686\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7d75570002929d20e40110d6b03e46202c9d1bc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/baabe43a0edefac8cd7b981ff87f967f6034dafe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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