CVE-2026-23242 (GCVE-0-2026-23242)
Vulnerability from cvelistv5
Published
2026-03-18 10:05
Modified
2026-08-05 12:20
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix potential NULL pointer dereference in header processing If siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(), qp->rx_fpdu can be NULL. The error path in siw_tcp_rx_data() dereferences qp->rx_fpdu->more_ddp_segs without checking, which may lead to a NULL pointer deref. Only check more_ddp_segs when rx_fpdu is present. KASAN splat: [ 101.384271] KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] [ 101.385869] RIP: 0010:siw_tcp_rx_data+0x13ad/0x1e50
References
Impacted products
Vendor Product Version
Linux Linux Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
Version: 8b6a361b8c482f22ac99c3273285ff16b23fba91
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-14T12:46:12.927Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_qp_rx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ab61841633d10e56a58c1493a262f0d02dba2f5e",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "8564dcc12fbb372d984ab45768cae9335777b274",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "ab957056192d6bd068b3759cb2077d859cca01f0",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "ffba40b67663567481fa8a1ed5d2da36897c175d",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "87b7a036d2c73d5bb3ae2d47dee23de465db3355",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "714c99e1dc8f85f446e05be02ba83972e981a817",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "ce025f7f5d070596194315eb2e4e89d568b8a755",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            },
            {
              "lessThan": "14ab3da122bd18920ad57428f6cf4fade8385142",
              "status": "affected",
              "version": "8b6a361b8c482f22ac99c3273285ff16b23fba91",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_qp_rx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix potential NULL pointer dereference in header processing\n\nIf siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(),\nqp-\u003erx_fpdu can be NULL. The error path in siw_tcp_rx_data()\ndereferences qp-\u003erx_fpdu-\u003emore_ddp_segs without checking, which\nmay lead to a NULL pointer deref. Only check more_ddp_segs when\nrx_fpdu is present.\n\nKASAN splat:\n[  101.384271] KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]\n[  101.385869] RIP: 0010:siw_tcp_rx_data+0x13ad/0x1e50"
        }
      ],
      "metrics": [
        {
          "cvssV3_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",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - SIW (Software iWARP) operates over TCP connections. A remote RDMA peer can send malformed DDP/RDMAP packets with invalid version or opcode fields to trigger the NULL pointer dereference in the TCP receive callback siw_tcp_rx_data().\nAC:L - The attacker can reliably trigger the bug by sending a malformed DDP packet with an invalid version or opcode field after establishing the TCP/RDMA connection. No race condition or special conditions required.\nPR:N - The vulnerability is triggered during iWARP protocol message processing from a connected TCP peer. While an RDMA connection must be established first, this is part of the network protocol and does not require authentication credentials \u2014 any peer that can connect to the SIW port can trigger this.\nUI:N - No user interaction is required. The attacker triggers the bug by sending malformed network packets to an SIW-enabled service.\nS:U - The vulnerability crashes the kernel, which is within the same security authority. There is no crossing of a security boundary like VM escape.\nC:N - This is a pure NULL pointer dereference (access at offset 0xc0 from NULL). No information disclosure occurs \u2014 the kernel oopses/panics without leaking data.\nI:N - This is a NULL pointer dereference causing a crash. There is no memory corruption, no write primitive, and no code execution \u2014 the access address (0xc0) is not mappable on modern kernels.\nA:H - The NULL pointer dereference causes a kernel oops or panic, crashing the system. This is reliably triggerable by a remote attacker sending malformed iWARP packets."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:20:52.020Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab61841633d10e56a58c1493a262f0d02dba2f5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/8564dcc12fbb372d984ab45768cae9335777b274"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab957056192d6bd068b3759cb2077d859cca01f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/ffba40b67663567481fa8a1ed5d2da36897c175d"
        },
        {
          "url": "https://git.kernel.org/stable/c/87b7a036d2c73d5bb3ae2d47dee23de465db3355"
        },
        {
          "url": "https://git.kernel.org/stable/c/714c99e1dc8f85f446e05be02ba83972e981a817"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce025f7f5d070596194315eb2e4e89d568b8a755"
        },
        {
          "url": "https://git.kernel.org/stable/c/14ab3da122bd18920ad57428f6cf4fade8385142"
        }
      ],
      "title": "RDMA/siw: Fix potential NULL pointer dereference in header processing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23242",
    "datePublished": "2026-03-18T10:05:05.108Z",
    "dateReserved": "2026-01-13T15:37:45.989Z",
    "dateUpdated": "2026-08-05T12:20:52.020Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.