Vulnerability-Lookup

CVE-2026-31608 (GCVE-0-2026-31608)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42

Title

smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list() smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(), so we should not call it again after post_sendmsg() moved it to the batch list.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/6968c91fab05b8fc4…
	https://git.kernel.org/stable/c/2ba03f46132b0d1a7…
	https://git.kernel.org/stable/c/830de6eeb9db4cb7e…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6968c91fab05b8fc4d6700e0cf34472bb422df25 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2ba03f46132b0d1a7bafb86e1ef61951a2254023 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 830de6eeb9db4cb7e758201fb99328ef4ca4b032 (git)

Linux

Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/transport_rdma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6968c91fab05b8fc4d6700e0cf34472bb422df25",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "2ba03f46132b0d1a7bafb86e1ef61951a2254023",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "830de6eeb9db4cb7e758201fb99328ef4ca4b032",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/transport_rdma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()\n\nsmb_direct_flush_send_list() already calls smb_direct_free_sendmsg(),\nso we should not call it again after post_sendmsg()\nmoved it to the batch list."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:42:30.137Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023"
        },
        {
          "url": "https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032"
        }
      ],
      "title": "smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31608",
    "datePublished": "2026-04-24T14:42:30.137Z",
    "dateReserved": "2026-03-09T15:48:24.122Z",
    "dateUpdated": "2026-04-24T14:42:30.137Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31608",
      "date": "2026-04-25",
      "epss": "0.00017",
      "percentile": "0.04073"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31608\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:40.063\",\"lastModified\":\"2026-04-24T17:51:40.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()\\n\\nsmb_direct_flush_send_list() already calls smb_direct_free_sendmsg(),\\nso we should not call it again after post_sendmsg()\\nmoved it to the batch list.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

MSRC_CVE-2026-31608

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-26 01:05

Summary

smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-31608

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-31608 smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list() - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31608.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()",
    "tracking": {
      "current_release_date": "2026-04-26T01:05:27.000Z",
      "generator": {
        "date": "2026-04-26T07:27:57.356Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-31608",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-04-26T01:05:27.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-31608",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "under_investigation": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-31608 smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list() - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31608.json"
        }
      ],
      "title": "smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()"
    }
  ]
}

FKIE_CVE-2026-31608

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-04-24 17:51

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()\n\nsmb_direct_flush_send_list() already calls smb_direct_free_sendmsg(),\nso we should not call it again after post_sendmsg()\nmoved it to the batch list."
    }
  ],
  "id": "CVE-2026-31608",
  "lastModified": "2026-04-24T17:51:40.810",
  "metrics": {},
  "published": "2026-04-24T15:16:40.063",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

GHSA-QX6Q-MQG9-4PX7

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(), so we should not call it again after post_sendmsg() moved it to the batch list.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-31608"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()\n\nsmb_direct_flush_send_list() already calls smb_direct_free_sendmsg(),\nso we should not call it again after post_sendmsg()\nmoved it to the batch list.",
  "id": "GHSA-qx6q-mqg9-4px7",
  "modified": "2026-04-24T15:32:35Z",
  "published": "2026-04-24T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31608"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-31608 (GCVE-0-2026-31608)

MSRC_CVE-2026-31608

FKIE_CVE-2026-31608

GHSA-QX6Q-MQG9-4PX7

Tags

Sightings

Nomenclature