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

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-06-16 20:38
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
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)
Affected: 5.10.209 , < 5.10.249 (semver)
Affected: 5.15.148 , < 5.15.199 (semver)
Affected: 6.1.75 , < 6.1.162 (semver)
Affected: 6.6.14 , < 6.6.122 (semver)
Affected: 5.4.268 , < 5.5 (semver)
Affected: 6.7.2 , < 6.8 (semver)
Create a notification for this product.
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)
Create a notification for this product.
Show details on NVD website
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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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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 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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-22998\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T20:38:02.086283Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T20:38:07.832Z\"}}], \"cna\": {\"title\": \"nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": 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{\"status\": \"affected\", \"version\": \"efa56305908ba20de2104f1b8508c6a7401833be\", \"lessThan\": \"32b63acd78f577b332d976aa06b56e70d054cbba\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee5e7632e981673f42a50ade25e71e612e543d9d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"70154e8d015c9b4fb56c1a2ef1fc8b83d45c7f68\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.209\", \"lessThan\": \"5.10.249\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.148\", \"lessThan\": \"5.15.199\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.75\", \"lessThan\": \"6.1.162\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.14\", \"lessThan\": \"6.6.122\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.268\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.7.2\", \"lessThan\": \"6.8\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/nvme/target/tcp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.249\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.199\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.162\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.122\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.67\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/nvme/target/tcp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/baabe43a0edefac8cd7b981ff87f967f6034dafe\"}, {\"url\": \"https://git.kernel.org/stable/c/76abc83a9d25593c2b7613c549413079c14a4686\"}, {\"url\": \"https://git.kernel.org/stable/c/7d75570002929d20e40110d6b03e46202c9d1bc7\"}, {\"url\": \"https://git.kernel.org/stable/c/fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4\"}, {\"url\": \"https://git.kernel.org/stable/c/3def5243150716be86599c2a1767c29c68838b6d\"}, {\"url\": \"https://git.kernel.org/stable/c/374b095e265fa27465f34780e0eb162ff1bef913\"}, {\"url\": \"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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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.