Skip to content
CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-22998

nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f775f2621c2ac5cc3a0b3a64665dad4fb146e510 to < baabe43a0edefac8cd7b981ff87f967f6034dafeaffected
  • 4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d to < 76abc83a9d25593c2b7613c549413079c14a4686affected
  • 2871aa407007f6f531fae181ad252486e022df42 to < 7d75570002929d20e40110d6b03e46202c9d1bc7affected
  • 24e05760186dc070d3db190ca61efdbce23afc88 to < fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4affected
  • efa56305908ba20de2104f1b8508c6a7401833be to < 3def5243150716be86599c2a1767c29c68838b6daffected
  • efa56305908ba20de2104f1b8508c6a7401833be to < 374b095e265fa27465f34780e0eb162ff1bef913affected
  • efa56305908ba20de2104f1b8508c6a7401833be to < 32b63acd78f577b332d976aa06b56e70d054cbbaaffected
  • ee5e7632e981673f42a50ade25e71e612e543d9daffected
  • 70154e8d015c9b4fb56c1a2ef1fc8b83d45c7f68affected
  • 5.10.209 to < 5.10.249affected
  • 5.15.148 to < 5.15.199affected
  • 6.1.75 to < 6.1.162affected
  • 6.6.14 to < 6.6.122affected
  • 5.4.268 to < 5.5affected
  • 6.7.2 to < 6.8affected

Linux Linux

Default version status: affected

  • 6.8affected
  • 0 to < 6.8unaffected
  • 5.10.249 to ≤ 5.10.*unaffected
  • 5.15.199 to ≤ 5.15.*unaffected
  • 6.1.162 to ≤ 6.1.*unaffected
  • 6.6.122 to ≤ 6.6.*unaffected
  • 6.12.67 to ≤ 6.12.*unaffected
  • 6.18.7 to ≤ 6.18.*unaffected
  • 6.19 to ≤ *unaffected

References