CVE-2026-22998

Estado: ModificadaAlta (7.5)—

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.

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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

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.79%
Percentil entre todas las CVEs puntuadas: 55
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1499.004 Application or System Exploitationimpact90 %

Vulnerabilidad remota (AV:N) sin autenticación en nvme-tcp del kernel Linux que causa NULL pointer dereference y negación de servicio (A:H) mediante H2C_DATA PDU malformado.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

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Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-476

Referencias

JSON original (NVD)

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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's data structures (cmd->req.sg and cmd->iov) 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 → both pointers NULL\n2. H2C_DATA PDU for READ command → cmd->req.sg allocated, cmd->iov NULL\n3. H2C_DATA PDU for uninitialized command slot → both pointers NULL\n\nThe fix validates both cmd->req.sg and cmd->iov before calling\nnvmet_tcp_build_pdu_iovec(). Both checks are required because:\n- Uninitialized commands: both NULL\n- READ commands: cmd->req.sg allocated, cmd->iov NULL\n- WRITE commands: both allocated"
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      "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 ('nvmet-tcp: Soluciona un pánico del kernel cuando el host envía una longitud de PDU H2C inválida') añadió la comprobación de límites de ttag y la validación de data_offset en nvmet_tcp_handle_h2c_data_pdu(), pero no validó si las estructuras de datos del comando (cmd-&gt;req.sg y cmd-&gt;iov) han sido inicializadas correctamente antes de procesar las PDUs H2C_DATA.\n\nLa función nvmet_tcp_build_pdu_iovec() desreferencia estos punteros sin comprobaciones de NULL. Esto puede ser provocado enviando una PDU H2C_DATA inmediatamente después 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-&gt;req.sg asignado, cmd-&gt;iov NULL\n3. PDU H2C_DATA para slot de comando no inicializado ? ambos punteros NULL\n\nLa solución valida tanto cmd-&gt;req.sg como cmd-&gt;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-&gt;req.sg asignado, cmd-&gt;iov NULL\n- Comandos WRITE: ambos asignados"
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