Vulnerability-Lookup

GHSA-QX6Q-MQG9-4PX7

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-27 15:30

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.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31608"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-415"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:40Z",
    "severity": "CRITICAL"
  },
  "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": "2026-04-27T15:30:45Z",
  "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"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42

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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6968c91fab05b8fc4…
https://git.kernel.org/stable/c/2ba03f46132b0d1a7…
https://git.kernel.org/stable/c/830de6eeb9db4cb7e…
https://git.kernel.org/stable/c/84ff995ae826aa6bb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7 , < 6968c91fab05b8fc4d6700e0cf34472bb422df25 (git) Affected: 79242e7b6bc63efec28b7c235bc320806afce6c0 , < 2ba03f46132b0d1a7bafb86e1ef61951a2254023 (git) Affected: 34abd408c8ba24d7c97bd02ba874d8c714f49db1 , < 830de6eeb9db4cb7e758201fb99328ef4ca4b032 (git) Affected: 34abd408c8ba24d7c97bd02ba874d8c714f49db1 , < 84ff995ae826aa6bbcc6c7b9ea569ff67c021d72 (git) Affected: 6.18.11 , < 6.18.24 (semver) Affected: 6.19.1 , < 6.19.14 (semver)
Linux	Linux	Affected: 7.0 Unaffected: 0 , < 7.0 (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0.1 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "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": "5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7",
              "versionType": "git"
            },
            {
              "lessThan": "2ba03f46132b0d1a7bafb86e1ef61951a2254023",
              "status": "affected",
              "version": "79242e7b6bc63efec28b7c235bc320806afce6c0",
              "versionType": "git"
            },
            {
              "lessThan": "830de6eeb9db4cb7e758201fb99328ef4ca4b032",
              "status": "affected",
              "version": "34abd408c8ba24d7c97bd02ba874d8c714f49db1",
              "versionType": "git"
            },
            {
              "lessThan": "84ff995ae826aa6bbcc6c7b9ea569ff67c021d72",
              "status": "affected",
              "version": "34abd408c8ba24d7c97bd02ba874d8c714f49db1",
              "versionType": "git"
            },
            {
              "lessThan": "6.18.24",
              "status": "affected",
              "version": "6.18.11",
              "versionType": "semver"
            },
            {
              "lessThan": "6.19.14",
              "status": "affected",
              "version": "6.19.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "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": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "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"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "6.18.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "6.19.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "7.0",
                  "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:42:49.778Z",
        "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"
        },
        {
          "url": "https://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72"
        }
      ],
      "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": "2026-06-14T17:42:49.778Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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

GHSA-QX6Q-MQG9-4PX7

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

Tags

Sightings

Nomenclature