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nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-22998

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-22998

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f775f2621c2ac5cc3a0b3a64665dad4fb146e510",
        "lessThan": "baabe43a0edefac8cd7b981ff87f967f6034dafe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d",
        "lessThan": "76abc83a9d25593c2b7613c549413079c14a4686",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2871aa407007f6f531fae181ad252486e022df42",
        "lessThan": "7d75570002929d20e40110d6b03e46202c9d1bc7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "24e05760186dc070d3db190ca61efdbce23afc88",
        "lessThan": "fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efa56305908ba20de2104f1b8508c6a7401833be",
        "lessThan": "3def5243150716be86599c2a1767c29c68838b6d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efa56305908ba20de2104f1b8508c6a7401833be",
        "lessThan": "374b095e265fa27465f34780e0eb162ff1bef913",
        "versionType": "git"
      },
      {
        "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"
  }
]
Related CVEs
CVE-2026-22998

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39723 · Revision 1
Added to Heist Feed
Publisher date
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